The Citizen's Guide publications are great primers on some of the most important water topics in Colorado. Each set includes one copy of each:
Citizen's Guide to Colorado Water Law
Citizen's Guide to Colorado's Interstate Compacts
Citizen's Guide to Colorado Water Conservation
Citizen's Guide to Colorado Water Quality Protection
Citizen's Guide to Colorado's Transbasin Diversions
Citizen's Guide to Colorado's Water Heritage
Citizen's Guide to Where Your Water Comes From
Citizen's Guide to Colorado Groundwater