This compilation of annual reports of 163 New York State institution libraries for the year ending March 31, 1981, presents data on total resident population, library materials, total circulation, library hours, percentage of population having direct access, total paid library staff, and dollar expenditures. The institutions represented are concerned with correctional services, drug abuse services, education, health, mental health, mental retardation, and developmental disabilities and youth. In a separate table, a comparative summary indicates annual library expenditures for salary, materials, and other categories by institution type since 1973, including percentages of increase and decrease. Appendices comprise a key to the abbreviations used; a directory of state institutions which includes their addresses, the state department and system with which they are associated, and the names of both the librarian and the head of the institution; a list of public library systems showing the institutions in the same geographical area; and a sample New York State Institution Library Annual Report Form. (ESR)