This digital map database consists of the ESRI ARC/INFO Version 7.0.3coverages used to generate the maps in Map Series MF-2264 A to E (Rheaand Wheeler, 1994a,b, Rhea and others, 1994, Wheeler and Rhea, 1994,Wheeler and others, 1994) and I-2521 (Rhea and Wheeler, 1995).