Photoengraving primer :
concise instructions for apprentice engravers or for those seeking simple yet practical knowledge of line and half-tone engraving /
by Stephen H. Horgan.

APA Citation

Horgan, S. H., Branton, T. (1920). Photoengraving primer: concise instructions for apprentice engravers or for those seeking simple yet practical knowledge of line and half-tone engraving. Boston, Mass.: American Photographic Publishing Co..

MLA Citation

Horgan, Stephen H., 1854-1941, and Teyla Branton. Photoengraving Primer: Concise Instructions for Apprentice Engravers Or for Those Seeking Simple Yet Practical Knowledge of Line And Half-tone Engraving. Boston, Mass.: American Photographic Publishing Co., 1920.