Professional association and advocacy groups for parks and recreation professionals. Their website includes information on certification tests and continuing education opportunities.
U.S. Department over a number of agencies including the National Park Service, Environmental Protection Agency, Bureau of Land Management, and U.S. Geological Service.
"Responsible for carrying out a variety of programs for the management and conservation, of resources on 256 million surface acres, as well as 700 million acres of subsurface mineral estate."