Columbia subject headings:
Astrolabes--Early works to 1800.
Astrolabes.
Māshāʼallāh, 730?-815? De operatione uel utilitate astrolabii.
Harvard subject headings:
Astrolabes--Early works to 1800
Astrology, Arab
Māshāʼallāh, 730?-815? De operatione uel utilitate astrolabii.
Princeton subject headings:
Astrolabes--Early works to 1800.
Astrology, Arab.