Magic Casements - A survey of school library history from the eighth to the twentieth century. A Ph. D. thesis by Laurel Anne Clyde, James Cook University, 1981. The entire document is available in pdf and other formats as an ePrint
School Libraries in the United States
Fifty Years of Supporting Children's Learning - A History of Public School Libraries and Federal Legislation, 1953 - 2000. This report by Joan S. Michie and Barbara A. Holton contains a great deal of statistical information about school libraries during this period.
The Knapp School Libraries Project - In 1962, the Knapp Foundation gave $1,300,000 to the AASL to fund the development of model school libraries which would demonstrate the effectiveness of good school libraries.
The Evolution of the Medieval Book - A very attractive site by the Division of Rare and Manuscript Collections of Cornell University Library. Note the section on books which could be chained to the wall which is a very useful idea.