TY - BOOK AU - Haykin,David Judson ED - Library of Congress. TI - Subject headings: a practical guide AV - Z695 .H36 U1 - 025.33 PY - 1951/// CY - Washington PB - U. S. Govt. Print. Off. KW - Subject headings, Library of Congress KW - Handbooks, manuals, etc KW - Subject headings N1 - Original t.p. has, at head of title: The Library of Congress; Includes bibliographical references ER -