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State by State land management policies regarding the related sport of Geocaching can be found at GeocachingPolicy.Info
Bureau of Land Management Policy.
Bureau of Land Management Public Lands Map
What NOT to include in your Time Capsule
Good general information from the Smithsonian Institution
TerraServer Aerial Map Link
International Time Capsule Society Form for registering.
Information on choosing and operating a hand held GPS unit.
Software Options for the Geocapsuling Adventure.
Time Capsule Time Line: Our Time Lines