There is very little published information available about occupational safety and health libraries. This study identified, described, and compared the occupational safety and health libraries in the United States. The questionnaire first filtered out those libraries that did not fit the definition of an occupational safety and health library; only those managers whose libraries fit the definition were asked to complete the entire questionnaire. The study investigated five areas: (1) library staff; (2) library users; (3) other libraries; (4) parent organization; and (5) geographic location. The study aimed to be a census and required a high response rate. From 130 questionnaires mailed out, a response rate of 81% was obtained, and 39 occupational safety and health libraries in 18 states and the District of Columbia were identified in the survey. Thirty-three respondents agreed to have their libraries appear in a directory of occupational safety and health libraries. Included in the appendices are the questionnaire and the directory of occupational safety and health libraries in the United States that resulted from this study. (Contains 34 references.) (Author/JLB)