For more information on historic preservation, please visit the following:
Casper Historic Preservation: http://www.casperwy.gov/cms/One.aspx?portalId=63067&pageId=11605621
The National Register of Historic Places Preservation Fundamentals - the process starts with Wyoming's state page: http://wyoshpo.state.wy.us/NationalRegister/index.aspx
Wyoming State Historic Preservation Office - http://wyoshpo.state.wy.us/
National Trust for Historic Preservation - http://www.preservationnation.org/