Field number : ROG 482
Collector : Helmut Rogozinski
Species : Mammillaria droegeana 
Locality : Mexicó : Querétaro (Sierra Zamorano) Google Maps * Geocode
Date : 1999
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http://www.mammillarias.net
Field number : ROG 557
Collector : Helmut Rogozinski
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (Sierra Zamorano) Google Maps * Geocode
Date : 2001
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http://www.mammillarias.net
Field number : ML 479
Collector : Michel Lacoste
Species : Mammillaria droegeana
Locality : Mexicó : Queretaro (km42.5 of road from Cerro la Laja , Tequisquiapan to Querétaro 2040m) Google Maps * Geocode
Date : 10/05/1994
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http://www.mammillarias.net
Field number : WM 8950
Collector : Wendell (Woody) Minnich
Species : Mammillaria droegeana
Locality : Carboneras, Querétaro, Mexicó Google Maps
Date :
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http://www.mammillarias.net
Field number : WM 8960
Collector : Wendell (Woody) Minnich
Species : Mammillaria droegeana
Locality : El Trigo, Querétaro, Mexicó Google Maps
Date :
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http://www.mammillarias.net
Field number : REPP 1819
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (Los Trigos, 2600m) Google Maps * Geocode
Date : 27/02/1983
Notes :
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http://www.mammillarias.net
Field number : REP 1819
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (Los Trigos, 2600m) Google Maps * Geocode
Date : 27/02/1983
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http://www.mammillarias.net
Field number : REPP 1823
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (South of Los Trigos, 2250m) Google Maps * Geocode
Date : 27/02/1983
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http://www.mammillarias.net
Field number : REP 1823
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (South of Los Trigos, 2250m) Google Maps * Geocode
Date : 27/02/1983
Notes :
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http://www.mammillarias.net
Field number : REPP 1829
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (Carboneras, 2300m) Google Maps * Geocode
Date : 28/02/1983
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http://www.mammillarias.net
Field number : REP 1829
Collector : Werner Reppenhagen
Species : Mammillaria droegeana
Locality : Mexicó : Querétaro (Carboneras, 2300m) Google Maps * Geocode
Date : 28/02/1983
Notes :
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http://www.mammillarias.net
Field number : PN 191
Collector : Wolfgang Plein
Species : Mammillaria droegeana
Locality : 5.4km South of Los Trigos, Sierra Zamorano, Querétaro, Mexicó 2538m Google Maps
Date :
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http://www.mammillarias.net