42 data base development services; computer services, namely, providing data bases in the following fields - scientific, technical, and government information; computer services, namely, providing on-line facilities for real-time interaction with other computer users concerning topics of general interest [ ; engineering services; technical consultation and research in the following fields - scientific, technical, business and government information, namely, analysis and documentation of scientific and technical information, namely, periodical magazines, series and non-serial publications, namely, books, booklets, reports, dissertations, patent specifications, brochures, conference lectures, computer printouts on paper and data carriers readable by machines, namely, magnetic tapes and magnetic disks ]