Period subdivisions under names of places :
used in the dictionary catalogs of the Library of Congress /
compiled and edited by Marguerite V. Quattlebaum.

APA Citation

Library of Congress. Subject Cataloging Division. (1950). Period subdivisions under names of places: used in the dictionary catalogs of the Library of Congress. Washington, DC: U.S. Gov't. Print. Off..

MLA Citation

Library of Congress. Subject Cataloging Division. Period Subdivisions Under Names of Places: Used In the Dictionary Catalogs of the Library of Congress. Washington, DC: U.S. Gov't. Print. Off., 1950.

Warning: These citations may not always be complete (especially for serials).