Contains materials related to Isadore Mudge Gilbert's work with children's periodicals during her time at Columbia. The series includes signed copies of British Literature: A Critical Survey and 232 Author Bibliographies by Fred B. Millett and The American Library Directory, 1927, both addressed to Mudge. It also includes card files of titles that the Columbia University Libraries Cataloging Department later used to prepare a catalog for the Historical Collection of Children's Literature. In addition, receipts from domestic and international book sellers and photocopies of various magazine pages appear in this series, as well as correspondence related to children's periodicals and bibliographical notes and lists regarding the library's collections.