Classification of Radio Subjects United States. National Bureau of Standards Published: 1930 Total Pages: 28 Get eBook
A Decimal Classification of Radio Subjects-- United States. National Bureau of Standards Published: 1923 Total Pages: 40 Get eBook
Revised Classification of Radio Subjects Used in National Bureau of Standards United States. National Bureau of Standards Published: 1946 Total Pages: 94 Get eBook
FAA Standard Subject Classification System United States. Federal Aviation Administration Published: 1977 Total Pages: 72 Get eBook
Circular of the Bureau of Standards United States. National Bureau of Standards Published: 1922 Total Pages: 844 Get eBook
Subject Heading List, Preliminary Edition National Agricultural Library (U.S.) Published: 1963 Total Pages: 1236 Get eBook
