Brunet, A. K., R. M. Zink, K. M. Kramer, R. C. Blackwell-Rago, S. L. Farrell, T. V. Line, and E. C. Birney. 2002. Evidence of introgression between masked shrews (Sorex cinereus), and prairie shrews (Sorex haydeni), in Minnesota. American Midland Naturali