Compilations or lists of writings that often include references to other books, periodicals and journals, articles in periodicals and journals, newspapers, government publications, micro-forms, manuscripts, etc. and often center around a specific topic.
(Text and resources taken from the print edition of: Jaccaud, Robert D, comp. Passages to Family History: A Guide to Genealogical Research in the Dartmouth College Library. Rev. ed. Hanover: Dartmouth College Library, 1994).