copyright 1951; Frederick Post Company publishers, Chicago; smaller hardbound; very good condition with unmarked pages; boards very good; no dust jacket.
 
from Introduction -
Early in 1950, a group of prominent professors and practicing engineers were approached with the problem of designing a practical slide rule for today's problems. They were asked to examine every existing concept of slide rule practice in the light of modern-day specialized needs and to develop a new slide rule that would be the ultimate in efficiency and practical usefulness.
 
This is the story of your new VERSALOG Slide Rule...designed by engineers...for engineers.