3709903 Rumford Chemical Works - Yeast and Baking Powder, Centennial Exhibition, Philadelphia, 1876 (albumen print) by Centennial Photographic Co. (fl.1876); Free Library of Philadelphia; (add.info.: Notes: Display of yeast and baking powder in containers, other food products. Notes: Exhibit title: Rumford Chemical Works, Providence, R.I., Exhibit #256, Agricultural Hall, Bldg. #152. ); by Free Library of Philadelphia ; Print and Picture Collection, Free Library of Philadelphia; American, out of copyright.