1956 Bausch & Lomb Book-Facts about Telescopic Sights,6" x 9" with 88 pages CONTENT: This softcover book has 5 chapters on 51 pages with general scope info including How to sight in,ZDevelopment of the telescopic sight,ZCorrection for eyesight defects,Trajectory of leading cartridges used with telescopic sights,Parallex,Chromatic aberration,Light transmission and over 28 more topics.There are 21 pages on B&L telescopic sights specifically and seven B&L scopes featured on 12 pages with prices.Dated "Copyright 1956" and the code on the back cover is "G-165, 20Apr. '57 C_H". Excellent Condition