Coca in the northwest Amazon.

Richard Evans Schultes
Journal of Ethnopharmacology 3 173 -194

21
1981
Petunia violacea: hallucinogen or not?

Edward Grant Butler , Trevor Robinson , Richard Evans Schultes
Journal of Ethnopharmacology 4 ( 1) 111 -114

4
1981
Plants in treating senile dementia in the northwest Amazon

Richard Evans Schultes
Journal of Ethnopharmacology 38 121 -128

47
1993