Prof. A. E. Dolbear - The Telephone,
very rare first edition 1877, New York press,
The first publication released on the subject of the telephone.
130p. with all plates, preface by the author detailing his invention status before the patent taken out by A. G. Bell in 1876, in the rarely seen red leatherette boards; G. B. Prescott - The Electric Telephone, first edition 1890, 795p., with all plates including diagram pull-outs, in brown leatherette boards, both in very good condition. (2)