During May 2004 to October 2005, small mammal surveys were conducted in Gettysburg National Military Park and Eisenhower National Historic Site to determine what federal or state threatened or endangered small mammal species may occur within the two park units. Survey transects consisting of 20 to 25 stations, each containing a single pitfall container and either three or four Museum Special(r) snaptraps, were established at 10 sites within both park units. The survey sites selected were areas which would likely support populations of the least shrew, Cryptotis parva, a species listed as endangered in Pennsylvania and the only state endangered species known to occur in south central Pennsylvania.