| 1. ||Books - - Guide to historic markers erected by the State Highway Department cooperating with the Minnesota Historical Society / prepared by the Minnesota Historical Records Survey Project, Division of Professional and Service Projects, Work Projects Administration. ||Minnesota - - Dept. of Highways. Minnesota Historical Society. Historical markers - - Minnesota. Minnesota - - Description and travel. Minnesora - - Guidebooks. WPA. ||iv, 39 leaves: map; 28 cm.