You searched for: Subject Environment Remove constraint Subject: Environment Place Massachusetts Remove constraint Place: Massachusetts Place United States Remove constraint Place: United States Place Arkansas Remove constraint Place: Arkansas Place Delaware Remove constraint Place: Delaware Format Shapefile Remove constraint Format: Shapefile Year 1966 Remove constraint Year: 1966
1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.