"The Log Log Duplex Trig Slide Rule," No. 4080 manual by Lyman M. Kells, Willis F. Kern, and James R. Bland, 1939 paperback edition with illustrations.
This pre-owned manual shows wear and staining to the cover and a personalization on the front cover.
There is one or two pages with writing and light handling wear consistent with age.
Ideal for collectors or slide rule enthusiasts seeking a vintage 1939 reference manual.
Topic:Slide Rule
Author:Lyman M. Kells; Willis F. Kern; James R. Bland