Field number : L 694
Collector : Alfred Bernhard Lau
Species : Mammillaria cowperae 
Locality : Mexicó : Zacatecas (Hornilos near Fresnillo 2300m) Google Maps * Geocode
Date : 26/05/1974
Notes :
together with Mamillaria zacatecasensis, Echinofossulocactus zacatecasensis
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http://www.mammillarias.net
Field number : LAU 694
Collector : Alfred Bernhard Lau
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Hornilos near Fresnillo 2300m) Google Maps * Geocode
Date : 26/05/1974
Notes :
together with Mamillaria zacatecasensis, Echinofossulocactus zacatecasensis
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http://www.mammillarias.net
Field number : DAR 53
Collector : Amante Darmanin
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Zacatecas) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : SH 694
Collector : Dennis Sargant (plants collected by Alfred Bernhard Lau)
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Hornilos near Fresnillo 2300m) Google Maps * Geocode
Date : 26/05/1974
Notes :
together with Mamillaria zacatecasensis, Echinofossulocactus zacatecasensis
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http://www.mammillarias.net
Field number : ROG 77
Collector : Helmut Rogozinski
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Presa de Hornillos) Google Maps * Geocode
Date : 1988
Notes :
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http://www.mammillarias.net
Field number : ROG 509
Collector : Helmut Rogozinski
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Los Hornillos) Google Maps * Geocode
Date : 1999
Notes :
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http://www.mammillarias.net
Field number : IDD 0296
Collector : Igor D. Dráb
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Fresnillo smer Valparaiso) Google Maps * Geocode
Date : 15/05/1993
Notes :
CSD 277 Presa de Linares
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http://www.mammillarias.net
Field number : CH 605a
Collector : Jaromír Chvastek
Species : Mammillaria cowperae
Locality : Fresnillo, Zacatecas, Mexicó 2145m Google Maps
Date : 12/05/1991
Notes :
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http://www.mammillarias.net
Field number : CSD 277
Collector : Jaromír Chvastek, Roman Staník, Igor Dráb
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Presa de Linares, Fresnillo towards Valparaiso) Google Maps * Geocode
Date : 16/05/1997
Notes :
IDD296
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http://www.mammillarias.net
Field number : PIL 456
Collector : Jörg and Brigitte Piltz
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Los Hornillos) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : P 456
Collector : Jörg and Brigitte Piltz
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Los Hornillos) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : ML 576
Collector : Michel Lacoste
Species : Mammillaria cowperae
Locality : Mexicó : Zacetecas (Los Hornillos , Fresnillo 2250m) Google Maps * Geocode
Date : 04/03/1996
Notes :
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http://www.mammillarias.net
Field number : MZ 794
Collector : Milan Zachar
Species : Mammillaria cowperae
Locality : Presa de Linares, Zacatecas, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : MZ 1275
Collector : Milan Zachar
Species : Mammillaria cowperae
Locality : Los Hornillos, Zacatecas, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : RS 452
Collector : Roman Staník
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Fresnillo direction to Valparaiso) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : VM 168
Collector : Vojtech Myšák
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Fresnillo) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : REP 1762
Collector : Werner Reppenhagen
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Presa Hornessillas, 2300m) Google Maps * Geocode
Date : 27/01/1981
Notes :
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http://www.mammillarias.net
Field number : REPP 1762
Collector : Werner Reppenhagen
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (Presa Hornessillas, 2300m) Google Maps * Geocode
Date : 27/01/1981
Notes :
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http://www.mammillarias.net
Field number : WK 138
Collector : Wolfgang Krueger
Species : Mammillaria cowperae
Locality : Mexicó : Zacatecas (km29 of ZAC-54, Los Hornillos, Fresnillo 2250m) Google Maps * Geocode
Date : 1991
Notes :
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http://www.mammillarias.net
Field number : WTH 298
Collector : Wolter ten Hoeve
Species : Mammillaria cowperae
Locality : A little East of Los Hornillos, Zacatecas, Mexicó Google Maps
Date : 2003
Notes :
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http://www.mammillarias.net