Carl Mydans, 1935 (46%) A step in artificial insemination, Prince George's County, Maryland |
Carl Mydans, 1935 (46%) One step in artificial insemination, Prince George's County, Maryland |
Carl Mydans, 1935 (42%) Artificial insemination of a cow, one step, Prince George's County, Maryland |
Arthur Rothstein, 1939 (38%) Step in artificial insemination experiments at range experiment station. Miles City, Montana |
Arthur Rothstein, 1939 (34%) Obtaining semen from stallion for artificial insemination experiments. Miles City, Montana |
