Columbia subject headings:
Harvard subject headings:
Academic libraries--United States--Directories.
Libraries--United States--Special collections--Directories.
Library resources--United States--Directories.
Manuscripts--Library resources--Directories.
Manuscripts--United States--Library resources--Directories.
Rare books--Library resources--Directories.
Rare books--United States--Library resources--Directories.
Princeton subject headings:
Academic libraries--United States--Directories.
Directories.
Libraries--United States--Special collections--Directories.
Library resources--United States--Directories.
Manuscripts--Library resources--United States--Directories.
Rare books--Library resources--United States--Directories.