Catalog Issue Year Decade: 1950 - 1959 / Sudoc Stem: C 21.12/2 - Blacklight Search Results

Start Over Catalog Issue Year Decade 1950 - 1959 Sudoc Stem C 21.12/2

1. Index to classification, Jan. 1956.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1956.]
SuDoc number:: C 21.12/2:956