Columbia subject headings:
Johnson, William Allen, 1816-1901.
Organ (Musical instrument)--United States.
Organ builders--United States--Biography.
Harvard subject headings:
Johnson, William Allen, 1816-1901.
Organ (Musical instrument)--Construction--United States.
Organ builders--United States--Biography.
Princeton subject headings:
Johnson, William Allen, 1816-1901.
Organ (Musical instrument)--United States.
Organ builders--United States--Biography.