General PC magazine Radio Science May 1977 issue

General PC magazine with supplement Radio Science September 1977 issue

General PC magazine with supplement Radio Science October 1977 issue

General PC magazine with appendix Radio Science February 1977 issue

General PC magazine Radio Science July 1977 issue

General PC magazine PC Magazine March 1987 issue

General PC magazine Radio Science October 1979 issue

General PC magazine Radio Science December 1976 issue