Title 50 - Wildlife and Fisheries
Chapter I -United States Fish And Wildlife Service, Department Of The Interior

You can see the entire page here; we've just pulled out the bits relevant to falconry for your convenience.

Part 1 - Definitions

Part 10 - General Provisions

Part 13 - General Permit Procedures

Part 15 - Wild Bird Conservation Act

Part 21 - Migratory Bird Permits

Part 22 - Eagle Permits

Part 23 - Endangered Species Convention