Rolleiflex Viewing and Focusing Systems (1974) Photo Equipment Technician Course. Illustrated with black & white photographs. Covers design of focusing system, adjusting parallax, optical adjustments, disassembly, repair of focusing system. Reprint of the National Camera Technical Training Division manual by Larry Lyells. English, 40 pages, 5-1/2"x8-1/4", printed on white paper, center stapled with cardstock cover.