http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
a classified list of libraries in the United States and Canada, with personnel and statistical data
Vols. for 1951- called 19th- ed.; issued in 2 vols., 36th ed., 1983-
Directory for 1927 accompanied by supplementary volume "comprising subject index to special collections in American libraries and greater libraries overseas, subject index to library literature recorded in 1927."
"Such a list was the principal feature of the American library annuals, issued in past years, the last volume in 1917-1918."--Foreword, 1923.