Columbia subject headings:
Harvard subject headings:
Dismal Swamp (N.C. and Va.)--Congresses.
Natural history--Dismal Swamp (N.C. and Va.)--Congresses.
Natural history--Dismal Swamp--Congresses.
Princeton subject headings:
Dismal Swamp--Congresses.
Natural history--Dismal Swamp--Congresses.