1. Map showing free-air gravity anomalies in parts of the western Caribbean Sea Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
2. Metropolitan areas (MSAs, CMSAs, and PMSAs) June 30, 1990 Author/Creator: United States. Bureau of the Census. Geography Division Publication/Creation: [Washington, D.C.] : The Bureau : For sale by the Supt. of Docs., U.S. G.P.O., 1990 Resource Type: Map Access & Availability: Loading