Columbia subject headings:
Antiquarian booksellers--Directories.
Books--Prices.
Incunabula--Bibliography--Union lists.
Union catalogs--Canada.
Union catalogs--United States.
Harvard subject headings:
Antiquarian booksellers--Directories.
Books--Prices
Incunabula--Bibliography--Union lists.
Incunabula--Canada--Bibliography--Union lists.
Incunabula--North America--Bibliography--Union lists.
Incunabula--United States--Bibliography--Union lists.
Union catalogs--Canada.
Union catalogs--United States.
Princeton subject headings:
Incunabula--Canada--Bibliography--Union lists.
Incunabula--United States--Bibliography--Union lists.
Union catalogs--Canada.
Union catalogs--United States.