North & Oswald, n.d., Back of carte de visite for North & Osword. Portrait & Landscape Photographers, New Studios, 32 & 33 Finlay's Chamber of Commerce, Toledo, O., Carte de visite, back, Private collection of Alan Griffiths, LL/36604
North & Oswald, n.d., Back of carte de visite for North & Osword. Portrait & Landscape Photographers, New Studios, 32 & 33 Finlay's Chamber of Commerce, Toledo, O., Carte de visite, back, detail, Private collection of Alan Griffiths, LL/36605
North & Oswald, n.d., Backmark for "North and Oswald's Art Studios, 32 33 Cor. Madison & Summit Sts. Chamber of Commerce, Toledo, O.", Carte de visite, back, Private collection of Beth Bilokryly, LL/127048
