Columbia subject headings:
Harvard subject headings:
Geophysics--Study and teaching (Higher)--Canada--Directories.
Geophysics--Study and teaching (Higher)--United States--Directories.
Universities and colleges--Canada--Directories.
Universities and colleges--United States--Directories.
Princeton subject headings:
Directories.
Geophysics--Study and teaching (Higher)--Canada--Directories.
Geophysics--Study and teaching (Higher)--United States--Directories.
Universities and colleges--Canada--Directories.
Universities and colleges--United States--Directories.