AgMaps is a system that allows Mann Library to distribute customized numeric data sets and thematic maps over the Web. To further the efforts of the AgMaps project, Mann Library is actively engaging in intellectual and financial collaboration with three New York County Extension offices, Cornell Cooperative Extension, Cornell faculty, and the National Agricultural Statistical Service of the USDA. After a brief discussion of the need for GIS and AgMaps in particular, this paper focuses on the roles each agency played in the process of creating AgMaps, describes the partnerships, highlights a user study employed for the interface design and presents AgMaps and some of its features. [ABSTRACT FROM PUBLISHER]