Columbia subject headings:
Harvard subject headings:
Azimuth--Periodicals.
Polestar--Periodicals.
Sun--Periodicals.
Surveying--Public lands--United States--Periodicals.
Princeton subject headings:
Azimuth--Periodicals.
Polestar--Periodicals.
Sun--Periodicals.
Surveying--Public lands--United States--Periodicals.