1. Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993 Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, VA : U.S. Geological Survey, 1994 Resource Type: Map Access & Availability: Loading
2. Metropolitan areas (MSAs, CMSAs, and PMSAs) July 1, 1994 : [United States] Author/Creator: United States. Bureau of the Census. Geography Division Publication/Creation: For sale by the U.S. G.P.O., Supt. of Docs.. Resource Type: Map Access & Availability: Loading
3. Metropolitan areas (MSAs, CMSAs, and PMSAs), June 30, 1993 Author/Creator: United States. Bureau of the Census. Geography Division Publication/Creation: [Washington, D.C.] : The Bureau : For sale by the U.S. G.P.O., Supt. of Docs., [1994?] Resource Type: Map Access & Availability: Loading