This work is absolutely vital to researchers seeking to locate pertinent data buried in the many genealogical and historical periodicals published in this country between 1858 and 1952. Each volume contains a name index, alphabetically arranged, and a place and subject index, all entries referring to articles appearing in more than fifty periodicals published during a time span of nearly 100 years. As a further aid to research, a valuable list of supplementary sources is included, such as the author's selective index of families treated in certain pedigree or ancestral books dealing chiefly with New England and New York families.