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Tread Lightly
This is another national site that should have more depth, but is a must see anyway.

BLM
Bureau of Land Management Off-Highway Motor Vehicle Recreation Division of the California Department of Parks and Recreation If you are interested in 4X4, Motorcycle, ATV, Sand Rail, Dune Buggy, Snowmobile, and any other off-road recreation in California, this page is for you. They have a well put together site.

USDA Forest Service Home Page
If you want to know what they are up to or just want to know more about them this is where to go to find out.

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