Robeson's Knoll, mouth of Wissahickon. [graphic] / John G. Bullock. Bullock, John G., 1854-1939 photographer. Depicts a large rock formation near the old Robeson estate at the mouth of the Wissahickon Creek near Ridge Avenue. Photographer's imprint printed on mount. Title and date given in manuscript on mount. Philadelphia PA. Philadelphia. 1914 1914 Lantern slides -- 1910-1920. 1 slide: lantern; 8 x 11 cm.(3.25 x 4 in.) digitool:4204 Library Company of Philadelphia Print Dept. lantern - Bullock [P.9731.136] P.9731.136 Part of Fairmount Park Fairmount Park (Philadelphia, Pa.)