History Colorado’s Office of Archaeology and Historic Preservation (OAHP) oversees a unique program celebrating Colorado’s agricultural heritage. The Centennial Farms program recognizes farms and ranches that have been operating for a century or more and whose owners have preserved the farms’ stories and structures. New farms are inducted each year, and History Colorado recently announced the 2015 honorees. For photos and stories from the 2015 honorees, see OAHP’s recent blog post. Search our library’s online catalog for more resources on Colorado’s farm and ranching heritage.