Tertiary Stratigraphy & Paleontology, Chesapeake Bay Region, Virginia & Maryland: Chesapeake Bay Region, Virginia & Maryland, July 15-July 17; 1989, pi-v, 5p
Tertiary Stratigraphy & Paleontology, Chesapeake Bay Region, Virginia & Maryland: Chesapeake Bay Region, Virginia & Maryland, July 15-July 17; 1989, p1-62, 62p