Columbia subject headings:
Genealogical libraries--United States--Directories.
Genealogy--Library resources--United States--Directories.
Historical libraries--United States--Directories.
Local history--Library resources--United States--Directories.
United States--Genealogy--Library resources--Directories.
United States--History, Local--Library resources--Directories.
Harvard subject headings:
Genealogical libraries--United States--Directories.
Genealogy--Library resources--Directories.
Historical libraries--United States--Directories.
Local history--Library resources--Directories.
United States--Genealogy--Library resources--Directories.
United States--History, Local--Library resources--Directories.
Princeton subject headings:
Genealogical libraries--United States--Directories.
Genealogy--Library resources--United States--Directories.
Historical libraries--United States--Directories.
Local history--Library resources--United States--Directories.
United States--Genealogy--Library resources--Directories.
United States--History, Local--Library resources--Directories.