[1] Data in the spreadsheet are based on: American Library Directory (1993), R.R. Bowker, New York; United States Bureau of Education (1876), Public libraries in the United States of America, United States Government Printing Office, Washington, D.C.; United States Bureau of Education [1896], Annual Report, United States Government Printing Office, Washington, D.C.; Bobinski, G. [1969], Carnegie Libraries; Their History and Impact on American Public Library Development, American Library Association, Chicago; and extensive correspondence with public libraries in the author's files.