A. Winogradsky & R. Morphy
B. Winogradsky & Dokuchaev
C. Bennett & Dokuchaev
D. both A & B
Submitted by: Mir Mehrbiyar
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A. Winogradsky & R. Morphy
B. Winogradsky & Dokuchaev
C. Bennett & Dokuchaev
D. both A & B
Submitted by: Mir Mehrbiyar
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