KEENAN, photographer. Seated portrait of a young woman wearing a lace-trimmed pullover shawl. (Heavy clouding, spotting, and tarnishing to plate, spotting to mat; no preserver present, original seals.) Housed in a full pressed paper case (heavy surface wear). Velvet pad stamped for Keenan, Philadelphia. -- CHASE, photographer. Bust portrait of a young gentleman with curly hair. (Clouding, spotting, and tarnishing to plate; original seals.) Housed under mat, glass, and preserver only, no case. Mat stamped for Chase. -- And 35 others. -- Together, 37 sixth plate portraits of men and women, many without full cases.