National union catalog of manuscript collections.
Library of Congress.cn
Library of Congress.Descriptive Cataloging Division.cn
Library of Congress.Manuscripts Section.cn
Washington, D.C. : Library of Congress,
1962-
"Based on reports from American repositories of manuscripts."
Description based on: Index 1980.
Vols. for 1959-62 compiled and edited by the Library of Congress and the Descriptive Cataloging Division of the Library of Congress;  by the Manuscripts Section, Descriptive Cataloging Division.
1959-62.  1 v.; 1963-65 in 1965; 1963-66 in 1966; 1967-68 in 1968; 1967-69 in 1969; 1970-74 in 1974; 1975-76 in 1976.
Manuscripts
Library of Congress catalogs