1031 Exchange Field Guide: National Association of Realtors
http://www.realtor.org/library/library/fg408

Natural Resources Conservation Service (NRCS)
http://www.nrcs.usda.gov/

Bureau of Land Management
http://www.blm.gov/wo/st/en.html

U.S. Forest Service: Colorado
Arapaho National Forest
Comanche National Grassland
Grand Mesa National Forest
Gunnison National Forest
Pawnee National Grassland
Pike National Forest
Rio Grande National Forest
Roosevelt National Forest
Routt National Forest
San Isabel National Forest
San Juan National Forest
Uncompahgre National Forest
White River National Forest

U.S. Forest Service: New Mexico
Carson National Forest
Cibola National Forest
Gila National Forest
Kiowa National Grassland
Black Kettle & McClellan Creek National Grassslands
Lincoln National Forest
Rita Blanca National Grassland
Santa Fe National Forest

Land Trust Alliance
http://www.landtrustalliance.org/

Colorado Department of Natural Resources
http://dnr.state.co.us/Page/DNRDefault.aspx

Colorado Division of Wildlife
http://www.wildlife.state.co.us/