Field number : L 1506
Collector : Alfred Bernhard Lau
Species : Mammillaria duoformis 
Locality : Mexicó : Puebla (Las Penas , Acatlan 1400-1500m) Google Maps * Geocode
Date : 10/02/1984
Notes :
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http://www.mammillarias.net
Field number : LAU 1506
Collector : Alfred Bernhard Lau
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Las Penas , Acatlan 1400-1500m) Google Maps * Geocode
Date : 10/02/1984
Notes :
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http://www.mammillarias.net
Field number : GLF 4241
Collector : Charles (Charlie) Edward Glass, Robert Alan (Bob) Foster (also see notes)
Species : Mammillaria duoformis
Locality : km 190, West of Tehuitzingo, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : SH 1506
Collector : Dennis Sargant (plants collected by Alfred Bernhard Lau)
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Las Penas , Acatlan 1400-1500m) Google Maps * Geocode
Date : 10/02/1984
Notes :
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http://www.mammillarias.net
Field number : FO 21
Collector : Felipe Otero
Species : Mammillaria duoformis aff.
Locality : Mexicó : Puebla (Xuchiapa) Google Maps * Geocode
Date : 19-Apr-80
Notes :
two spines
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http://www.mammillarias.net
Field number : ROG 367
Collector : Helmut Rogozinski
Species : Mammillaria duoformis
Locality : Mexicó : Oaxaca (El Molino) Google Maps * Geocode
Date : 1994
Notes :
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http://www.mammillarias.net
Field number : LRM 357
Collector : Living Rocks of Mexico. Now Geoff Bailey, John Miller, previously also David (Dave) Rushforth.
Species : Mammillaria duoformis
Locality : Cuatla, Morelos, Mexicó Google Maps
Date : 25/06/09
Notes :
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http://www.mammillarias.net
Field number : ML 34
Collector : Michel Lacoste
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Entronque Las Peñas 1250m) Google Maps
Date : 07/07/1989
Notes :
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http://www.mammillarias.net
Field number : ML 347
Collector : Michel Lacoste
Species : Mammillaria duoformis
Locality : Mexicó : Oaxaca (10km West of Huajuapan de León, 2km South-West of Santa María Xochixtlapilco, OAX-15 1700m) Google Maps
Date : 03/05/1992
Notes :
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http://www.mammillarias.net
Field number : ML 349
Collector : Michel Lacoste
Species : Mammillaria duoformis
Locality : Mexicó : Oaxaca (km12 of MEX-190, South of Vista Hermosa, South of Huajuapan de León 1700m) Google Maps
Date : 03/05/1992
Notes :
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http://www.mammillarias.net
Field number : WM 4391
Collector : Wendell (Woody) Minnich
Species : Mammillaria duoformis
Locality : Acatlán de Osorio, Puebla, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 6351
Collector : Wendell (Woody) Minnich
Species : Mammillaria duoformis
Locality : El Papayo, Acatlán de Osorio, Puebla, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 6361
Collector : Wendell (Woody) Minnich
Species : Mammillaria duoformis
Locality : El Papayo, Acatlán de Osorio, Puebla, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : REPP 834
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (La Colimaina, 1100m) Google Maps * Geocode
Date : 24/09/1974
Notes :
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http://www.mammillarias.net
Field number : REP 834
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (La Colimaina, 1100m) Google Maps * Geocode
Date : 24/09/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 837
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (La Canada, 1200m) Google Maps * Geocode
Date : 27/09/1974
Notes :
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http://www.mammillarias.net
Field number : REP 837
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (La Canada, 1200m) Google Maps * Geocode
Date : 27/09/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 846
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Las Penas, 1100m) Google Maps * Geocode
Date : 04/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 846
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Las Penas, 1100m) Google Maps * Geocode
Date : 04/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 848
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Cerro Gordo/Acatlan, 1200m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 848
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Cerro Gordo/Acatlan, 1200m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 849
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Guadalupe, 1100m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 849
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Guadalupe, 1100m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 850
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Tehuixtla, 1200m) Google Maps * Geocode
Date : 06/10/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 850
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Tehuixtla, 1200m) Google Maps * Geocode
Date : 06/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 854A
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Petlalcingo, 1300m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REPP 854A
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Petlalcingo, 1300m) Google Maps * Geocode
Date : 05/10/1974
Notes :
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http://www.mammillarias.net
Field number : REP 1044A
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Mecquitepec/Acatlan, 1250m) Google Maps * Geocode
Date : 31/10/1975
Notes :
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http://www.mammillarias.net
Field number : REPP 1044A
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Mecquitepec/Acatlan, 1250m) Google Maps * Geocode
Date : 31/10/1975
Notes :
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http://www.mammillarias.net
Field number : REP 1319
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Boqueroncito, 1200m) Google Maps * Geocode
Date : 24/01/1978
Notes :
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http://www.mammillarias.net
Field number : REPP 1319
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Puebla (Boqueroncito, 1200m) Google Maps * Geocode
Date : 24/01/1978
Notes :
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http://www.mammillarias.net
Field number : REPP 1659
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Oaxaca (Huajuapan, 2000m) Google Maps * Geocode
Date : 20/12/1980
Notes :
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http://www.mammillarias.net
Field number : REP 1659
Collector : Werner Reppenhagen
Species : Mammillaria duoformis
Locality : Mexicó : Oaxaca (Huajuapan, 2000m) Google Maps * Geocode
Date : 20/12/1980
Notes :
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http://www.mammillarias.net
Field number : REPP 1677
Collector : Werner Reppenhagen
Species : Mammillaria duoformis v. xuchiapensis
Locality : Mexicó : Puebla (Xuchiapa, 1400m) Google Maps * Geocode
Date : 04/01/1981
Notes :
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http://www.mammillarias.net
Field number : REP 1677
Collector : Werner Reppenhagen
Species : Mammillaria duoformis v. xuchiapensis
Locality : Mexicó : Puebla (Xuchiapa, 1400m) Google Maps * Geocode
Date : 04/01/1981
Notes :
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http://www.mammillarias.net
Field number : WTH 163
Collector : Wolter ten Hoeve
Species : Mammillaria duoformis
Locality : On a hill east of the MEX-190, South of Izucar de Matamoros, Puebla, Mexicó Google Maps
Date : 2002
Notes :
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http://www.mammillarias.net