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Man working in a laboratory
UMG22A20_495

Man working in a laboratory

Hygiene Laboratory
UMG22A20_258

Hygiene Laboratory

Man working in a laboratory circa 1936.
UMG21A22_398

Man working in a laboratory circa 1936.

Man working in Laboratory circa 1935.
UMG21A22_481

Man working in Laboratory circa 1935.

Chemist Working In A Lab
UMG20A12_395

Chemist Working In A Lab