A set of twelve stereoscopic views in Yosemite National Park with folding stereoscope [box title]. Berkeley: California Laboratory Supply Co., 1939. Twelve gelatin silver photograph stereo views on stiff paper cards (ten measure 9 x 15 cm, two are slightly larger); folding stereoscope with horizontally adjustable lenses. All laid in a two-part box with printed paper label on lid; box measures 16 x 13.5 x 2 cm. The photographs are all copyright 1938, patent date for the folding stereoscope is 31 January 1939. An uncommon set of stereo views of Yosemite, complete with the stereoscope, instructions, and box. One photograph is a bit toned and faded, otherwise the images are fine. The box is rubbed at edges. (#157250).