550 pages of Instructions from models of K&E slide rules that are no longer produced. This is a reference work to preserve slide rules manuals. Many companies, such as Keuffel & Esser, are no longer in business after the 1970s. The instruction manuals were rarely ever sold separately from the slide rules, and many were lost over time. This preservation project is to provide a composite hard copy book and quality digital reprints of restored instructions from the most popular manufacturer's slide rule models. K&E III Volume 33 is a continuation of K&E Volume 2 and K&E II Volume 32, which was previously published. There were numerous model numbers and associated manuals from K&E, so K&E IV Volume 34 is required to complete the preservation project. Specialized K&E slide rule manuals are published in Volumes 15, 19, and 20. K&E Instruction Books Contained in Volume 33. Book 1 – Keuffel & Esser's 100 year Commemorative Booklet– “The First Century of K&E 1867-1967.” 41 pages. Book 2 – K&E - “The Log Log Trig Slide Rule” (with the trigonometric scales divided to degrees and minutes). The original 1932 typewritten instructions. 7 pages. Book 3 – K&E - “The Log Log Decitrig Slide Rule” (with the trigonometric scales divided to degrees and decimal degrees). The original 1932 typewritten instructions. 8 pages. Book 4 – K&E - “The Mannheim Slide Rule.” Models 4031S, N4035S N4041 and 4051. By William E. Breckenridge. 1938. 78 pages. Book 5 – K&E - “The Polyphase Duplex Trig Slide Rule.” Model 4070. By Kells, Kern and Bland. 1939. 94 pages. Book 6 – K&E - “The Log Log Duplex Slide Rule.” Model N4092-3. By William E. Breckenridge. 1932. 145 pages. Book 7 – K&E - “Polyphase Pocket Slide Rules.” Model 68-1643 and 68-1648. 1947. 21 pages. Book 8 – K&E - “Log Log Duplex Trig.” Model N4080. By Kells, Kern and Bland. 1948. Includes Supplement “The DI Scale.” 1953. 139 pages. Book 9 – K&E - K&E - “The DI Scale on the Log Log Duplex Decitrig (and Log Log Duplex Trig) Slide Rule.” Supplement to the manuals 4081 and 4080. 1953. 7 pages.