Slide-rule.

A manual for the slide rule Machovina, Paul E. 1950 A manual of the slide rule Thompson, James Edgar 1930 Basic slide rule operation Mittelstadt, W. S. 1971 Easy introduction to the slide rule Asimov, Isaac 1965 Graphical solutions Mackey, Charles O. 1944 Slide rule Bishop, Calvin Collier 1952 Slide rule calculations Cooper, H. O. 1931 Slide rule simplified Harris, Charles Overton 1943 Teach Yourself The Slide Rule Author not listed Year not listed Teach yourself the slide rule Snodgrass, Burns 1955 Versalog slide rule Fiesenheiser, E. I. 1951