Description: Dr. Bruce B. Collette (NOAA) demonstrates to Edgar "Nat" Gramblin (NMNH), the removal of a flesh sample from a thirty year old skipjack tuna from Peru for determination of levels to total mercury and methyl mercury, 71-70-1.
Description: Young museum visitors with horse and carriage outside the United States National Museum, now known as the Arts and Industries Building, SIA_000095_B67_F16_004.