The log log duplex decitrig slide rule, no. 4081
Subtitle: a manual
By: by Lyman M. Kells, Willis F. Kern, and James R. Bland.
Contributors: Kern, Willis F., joint author.; Bland, James R., joint author.; Keuffel & Esser Co..
Publisher: Keuffel & Esser
Published: 1938
Place of publication: New York
Language: eng
Number of pages: 101
Subjects: Slide-rule.
Notes: Includes index.

"Answers": p. 93-99.