This survey of telefacsimile use in U.S. libraries was compiled from questionnaires sent to state libraries during 1975, asking if the libraries were part of a telefacsimile network and/or if they knew of any such network in their state. Responses came from all states with the exception of Kansas, New Jersey and Massachusetts. The purpose of the survey was to ascertain the effectiveness of telefacsimile for interlibrary loan functions. The advantages and disadvantages of telefacsimile use vs. teletype use were given by respondents. Included among the advantages were: (1) the machine is quiet, operates easily, and requires less physical space than teletype; and (2) it is almost half the cost of teletype. Some of the disadvantages included: (1) the success of a telecopier system is much more dependent upon the cooperation of other libraries than a teletype system; and (2) a telecopier requires an attendant for both sending and receiving while teletype does not. Responses to the survey are included and arranged alphabetically by state with pertinent annotations. Reports on telefacsimile operations from various library networks are appended, as are the questionnaire and the names and addresses of organizations that received the questionnaire. (AP)