Columbia subject headings:
Harvard subject headings:
Archaeoastronomy--Scotland.
Astronomers--Scotland--Biography.
Engineers--Scotland--Biography.
Stone circles--Scotland.
Thom, A. (Alexander)
Thom, A. (Alexander), 1894-1985.
Princeton subject headings:
Archaeoastronomy--Scotland..
Astronomers--Scotland--Biography.
Engineers--Scotland--Biography.
Stone circles--Scotland.
Thom, A. (Alexander), 1894-1985.