Columbia subject headings:
Houghton Library--History.
Manuscripts--Collectors and collecting--Massachusetts--Cambridge--History--20th century.
Rare book libraries--Massachusetts--Cambridge--History--20th century.
Harvard subject headings:
Houghton Library--History--Chronology.
Rare book libraries--Massachusetts--Cambridge--History.
Princeton subject headings:
Houghton Library--History.
Manuscripts--Collectors and collecting--Massachusetts--Cambridge--History--20th century.
Rare book libraries--Massachusetts--Cambridge--History--20th century.