Columbia subject headings:
Detroit Observatory.
Tappan, Henry Philip, 1805-1881.
Harvard subject headings:
Astronomical observatories--Michigan.
Tappan, Henry Philip, 1805-1881.
University of Michigan. Detroit Observatory.
Princeton subject headings:
Astronomers--United States--Biography.
Detroit Observatory--History.
Tappan, Henry Philip, 1805-1881.