Rachel Carson National Wildlife Refuge :
trail guide.

APA Citation

U.S. Fish and Wildlife Service. (2001). Rachel Carson National Wildlife Refuge: trail guide. [Washington, D.C.?]: U.S. Fish & Wildlife Service.

MLA Citation

U.S. Fish and Wildlife Service. Rachel Carson National Wildlife Refuge: Trail Guide. [Washington, D.C.?]: U.S. Fish & Wildlife Service, 2001.

Warning: These citations may not always be complete (especially for serials).