41. Pennsylvania Publication/Creation: [S.l.] : Maps.com, c1999 Resource Type: Map Access & Availability: Loading
42. Pennsylvania Author/Creator: United States. Bureau of the Census. Geography Division Publication/Creation: Washington, D.C. : U.S. Dept. of Commerce, Bureau of the Census, [1983] Resource Type: Map Access & Availability: Loading
43. People on the move an atlas of migration Publication/Creation: Berkeley : University of California Press, [2010] Resource Type: Map Access & Availability: Loading
44. Peoples Republic of China : administrative atlas Author/Creator: United States. Central Intelligence Agency Publication/Creation: [Washington, D.C.] : The Agency, 1975 Resource Type: Map Access & Availability: Loading
45. Per capita money income for 1959, by counties of the United States Author/Creator: United States. Bureau of the Census Publication/Creation: Washington, D.C. : U.S. Government Printing Office, 1966 Resource Type: Map Access & Availability: Loading
46. Per capita retail sales in the United States, by counties, 1972 Author/Creator: United States. Bureau of the Census Publication/Creation: Washington : For sale by the Supt. of Docs., U.S. Govt. Print. Off Resource Type: Map Access & Availability: Loading
47. Percent change in corn yield per acre : by counties of the United States: 1939-1964 Author/Creator: United States. Bureau of the Census. Geography Division, cartographer Publication/Creation: Washington, D.C. : For sale by the Superintendent of Document, U.S. Government Printing Office, 1970 Resource Type: Map Access & Availability: Loading
48. Percent change in manufacturing employment by counties of the United States, 1967 to 1972 Author/Creator: United States. Bureau of the Census Publication/Creation: [Washington, D.C.] : Bureau of the Census, Geography Division : For sale by the Supt. of Docs., U.S. Govt. Print. Off., [1978] Resource Type: Map Access & Availability: Loading
49. Percent change in size of farms, by counties of the United States, 1940-1964 Author/Creator: United States. Bureau of the Census. Geography Division, cartographer Publication/Creation: Washington, D.C. : For sale by the Superintendent of Documents, U.S. Government Printing Office., 1970 Resource Type: Map Access & Availability: Loading
50. Percent change in the value of farm products sold per acre of land in farms : by counties of the United States, 1939-1964 Author/Creator: United States. Bureau of the Census. Geography Division, cartographer Publication/Creation: Washington, D.C. : For sale by the Superintendent of Documents, U.S. Government Printing Office, 1970 Resource Type: Map Access & Availability: Loading