Classification :
Library of Congress Subject Cataloging Division
Classification : Class T : Technology. - 4th ed. - Washington : Govt. print. off, 1948 (Reprinted 1953). - 325 p.
Classification--Books--Technology
Classification, Library of Congress
Classification--Books--General works
Classification : Class T : Technology. - 4th ed. - Washington : Govt. print. off, 1948 (Reprinted 1953). - 325 p.
Classification--Books--Technology
Classification, Library of Congress
Classification--Books--General works