John B. HeywoodMarine, December 1867. Cape Ann. Stereoscopic prints on albumen paper glued to cardboard. Date, photographer's and shooter's credit on label laminated on reverse. 7.5 x 14.5 cmJohn B. HeywoodMarine study , December 1867. Cape Ann. Stereoscopic albumen print, mounted on cardboard. Date, photographer's and printer's credit on a label mounted on verso. 7.5 x 14.5 cm