A survey of the reference departments of public libraries in Arizona, Colorado, New Mexico, and Utah was conducted to determine whether CD-ROM products are being used in routine reference work. Previous literature on CD-ROM had primarily been concerned with the response to and acceptance of the technology by patrons. A stratified sample of public libraries containing at least 50,000 volumes was used to allow comparisons between different size libraries and their use of CD-ROMs. Of the 68 surveys sent out, 57 were returned. Of the libraries replying, 65 percent used CD-ROM products. A slight majority of these libraries, 58.8 percent, indicated that the reference staff used CD-ROMs routinely. However, use by patrons was found to be more important than use by staff when selecting a CD-ROM product. Six tables and two figures present study data. Four appendixes contain the questionnaire, its cover letter, and two lists of CD-ROM products. (Contains 14 references.) (SLD)