Folder: S.F. Islands-Yerba Buena.
On back: "Commander L. E. Clifford, U. S. N. (left), produces tear gas in a pan at lower left as civilian employees of the Navy, attired in new civilian gas masks, look on during a demonstration of the masks Jan. 31 at Yerba Buena Island, naval training station. None of the 50 employees participating got even a whiff of the gas. ASSOCIATED PRESS PHOTO. FX adc NYneg&CX1 dc 1/31/41 stf-rjf".
"Associated Press Photograph."