The Philadelphia Photographer: January, 1873. E-book. Formato PDF Edward L. Wilson   -  Forgotten Books, 2017  - 

Patents and Patent Rights, 133 photo-mechanical Printing Processes, 158, 241 Printing and Toning. J. H. Abbott, 166 Printing Medallions, Contrivance for. C. L. Curtis, Panoramic Views, Correctness in. Dr. H. Vogel.

Wilson's Photographics: A Series of Lessons, Accompanied by Notes, on All the Processes Which Are Needful in the Art of Photography. E-book. Formato PDF Edward L. Wilson   -  Forgotten Books, 2017  - 

Can do it With their native brain? Since then I have come to appreciate the work of the author who consults wiser heads than his own, and I come into his plan with due humility.