TY  - BOOK
AU  - Schmalzel,R.J.
TI  - Demographic study of the rare Coryphantha robbinsorum (Cactaceae) in southeastern Arizona
UR  - https://drive.google.com/file/d/1yCKQIPpdh0aFlkeAOsH7qN-CbUrM_8CH/view?usp=drivesdk
ER  -