Photomechanics and printing; practical information on platemaking and presswork by recognized procedures [by] J.S. Mertle [and] Gordon L. Monsen. Mertle, J. S. (Joseph Stephen), 1899- Monsen, Gordon L., author. Photomechanical processes. 655.32 MEP Chicago, Mertle Pub. Co., l957. l957. 1957 Text 423 p. eng