Columbia subject headings:
Astronomers--North America--Directories.
Astronomy--Study and teaching (Higher)--North America--Directories.
Geophysicists--North America--Directories.
Geophysics--Study and teaching (Higher)--North America--Directories.
Physicists--North America--Directories.
Physics--Study and teaching (Higher)--North America--Directories.
Universities and colleges--North America--Directories.
Harvard subject headings:
Astronomers--North America--Directories.
Astronomy--Study and teaching (Higher)--North America--Directories.
Geophysicists--North America--Directories.
Geophysics--Study and teaching (Higher)--North America--Directories.
Physicists--North America--Directories.
Physics--Study and teaching (Higher)--North America--Directories.
Universities and colleges--North America--Directories.
Princeton subject headings:
Astronomers--North America--Directories.
Astronomy--Study and teaching (Higher)--North America--Directories.
Geophysicists--North America--Directories.
Geophysics--Study and teaching (Higher)--North America--Directories.
Physicists--North America--Directories.
Physics--Study and teaching (Higher)--North America--Directories.
Universities and colleges--North America--Directories.