Columbia subject headings:
Ordnance--Research--Maryland--Indian Head.
United States Naval Ordnance Station (Indian Head, Md.)--History.
United States. Navy--Ordnance and ordnance stores--History.
Harvard subject headings:
Ordnance--Research--Maryland--Indian Head.
United States Naval Ordnance Station (Indian Head, Md.)--History.
United States. Navy--Ordnance and ordnance stores--History.
Princeton subject headings: