A survey of 1,006 individuals was undertaken in Summer 1973 to aid the Advisory Committee of the Colorado Council for Library Development in its revision of the Colorado Plan for Library Development. Of interest to the Council were the opinions, attitudes, and reported behavior of the state's citizens concerning information needs and libraries. Particular emphasis is given to the differences in responses among the state's seven regional library systems. Data contained in the report includes; (1) library usage in the state by type of library--public, secondary school and college, and special libraries, (2) evaluations of public libraries, (3) usage and potential usage of selected library services, and (4) attitudes toward libraries and their purposes. A concluding assessment of the information needs of the people of Colorado is also provided. (Author/DGC)