Authors: Sperry, R

Citation: R. Sperry, It's a groove thing, NEW SCI, 165(2225), 2000, pp. NIL_1-NIL_1

Authors: Sperry, R

Citation: R. Sperry, Geographic information for the 21 century - Overview on a series of articles, PHOTOGR E R, 65(10), 1999, pp. 1124-1124

Authors: Sperry, R Donahue, A

Citation: R. Sperry et A. Donahue, National spatial data infrastructure - Make no small plans, PHOTOGR E R, 65(10), 1999, pp. 1125