H.M. Clifford, n.d., Back of carte de visite for Clifford, Philadelphia College of Photography, 270 South Second Street, Above Spruce St., Carte de visite, back, Private collection of Alan Griffiths, LL/36578
H.M. Clifford n.d. Back of carte de visite for Clifford, Philadelphia College of Photography, 270 South Second Street, Above Spruce St.
