Zusatz anfangs: A classified list of libraries with names of librarians and statistical data comp. triennially
Teils mit Jg.-Zählung
Ab 41.1988/89 inhaltl. Gliederung in Vol. 1: Alabama - New Mexico; Vol. 2: New York - Index; später in Vol. 1: Libraries in the United States; Vol. 2: Libraries in Canada, library networks, consortia & schools, index