Columbia subject headings:
Harvard subject headings:
Cartography--Congresses
Photogrammetry--Congresses
Remote sensing--Congresses.
Surveying--Congresses
Princeton subject headings:
Cartography--Congresses.
Cartography--United States--Congresses.
Photogrammetry--Congresses.
Photogrammetry--United States--Congresses.
Surveying--Congresses.
Surveying--United States--Congresses.