The Iowa Small Mammal Project page is here.
We present a data set of approximately 12,000 records of small mammals collected in Iowa between 1972 and 1993. When possible, the records include species, coordinates of observation or capture, gender, reproductive status and data, standard measurements (Hall 1962) and other identifiable characteristics. We also include habitat information and GIS data and maps for download.
Bowles, J.B., D.M. Dobson, and R.P. Lampe, 2009. Iowa small mammal database (online data archive), http://www.guilfordgeo.com/iowamammals