Federal Historic Preservation Tax Incentives
National Register of Historic Places - how to list a property, National Register database, visiting historic properties, etc.
National Trust for Historic Preservation: private nonprofit organization dedicated to protecting historic structures
Advisory Council on Historic Preservation: the only federal agency devoted solely to matters of historic preservation.
Preserve Net: a comprehensive database for preservationists
North Dakota State Historical Society
John Caron's Fargo History Site
James Lileks' Fargo History Site