by Carlton E. Turner
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Cocaine
The marijuana controversy
Constituents of Cannabis sativa L.
Beiträge zur Kenntniss der Gattung Eryth...
Ten new species of Erythroxylum (Erythro...
Structural variations in Erythroxylon le...
Erythroxylon coca in the Peruvian highla...
La hoja increíble
The botanical origin of coca leaves