Columbia subject headings:
Asteroids--Collisions with Earth--Congresses.
Geology, Structural--Chesapeake Bay Region (Md. and Va.)--Congresses.
Meteorite craters--Chesapeake Bay (Md. and Va.)--Congresses.
Harvard subject headings:
Asteroids--Collisions with Earth--Congresses.
Geology, Structural--Chesapeake Bay Region (Md. and Va.)--Congresses.
Meteorite craters--Chesapeake Bay (Md. and Va.)--Congresses.
Princeton subject headings:
Asteroids--Collisions with Earth--Congresses.
Geology, Structural--Chesapeake Bay Region (Md. and Va.)--Congresses.
Meteorite craters--Chesapeake Bay (Md. and Va.)--Congresses.