Library of Congress classification - Library of Congress.. Cataloging Policy and Support Office (Washington, D.C. : Library of Congress, Cataloging Distribution Service, 1998)
P-PZ Language and Literature : Tables (ed. 1982, 2004) Q Science (ed. 1989) R Medicine (ed. 1995) S Ariculture (ed. 1982) T Technology (ed. 1995) U Military Science (ed. 1992) V Naval Science (ed. 1993) Z Bibliography and Library Science (ed. 1980)