Incoming Resources
- Dept. of the Treasury, Internal Revenue Service, Washington, D.C.?
- U.S. Dept. of Agriculture, Natural Resources Conservation Service, Washington, D.C.?, 1999
- U.S. Dept. of Agriculture, Soil Conservation Service, Washington, D.C.?, 1989
- National Geographic, Distributed by Warner Home Video, Washington, D.C.?, Burbank, Calif.?, c2008
- U.S. Dept. of Agriculture, Soil Conservation Service, Washington, D.C.?, 1987
- National Geographic, Washington, D.C.?, c2009