Dakota County Historical Society
The Dakota County Historical Society was formed in 1939 to preserve, interpret, and promote the history of Dakota County. http://www.dakotahistory.org  

Rethos
The official website of Rethos (formerly the Preservation Alliance of Minnesota). Minnesota's only non­profit preservation advocacy and education organization. https://www.rethos.org  

Minnesota Historical Society (MNHS)
Great information about historic sites in Minnesota and online access to collections of historical photographs, records, and artifacts. MNHS is also home to the Minnesota State Historic Preservation Office (SHPO) www.mnhs.org

National Trust for Historic Preservation
As the nation’s leading voice of preservation, the National Trust for Historic Preservation is focused on saving America’s historic places. http://www.preservationnation.org  

National Park Service
The Park Service administers the National Register of Historic Places and the Secretary of the Interior's Standards for Rehabilitation. http://www.nps.gov/history  

National Alliance of Preservation Commissions
It is the only national nonprofit organization dedicated to supporting local historic preservation commissions and the historic resources they help protect. http://napcommissions.org  

Old House Journal
Contains articles about maintenance, repairs, and preserving historic structures. https://www.oldhouseonline.com