Columbia subject headings:
Canada--Relations--United States--Congresses.
Libraries--Canada--Congresses.
Library cooperation--North America--Congresses.
Library science--Canada--Congresses.
United States--Relations--Canada--Congresses.
Harvard subject headings:
Canada--Relations--United States--Congresses.
Libraries--Canada--Congresses.
Library cooperation--North America--Congresses.
Library science--Canada--Congresses.
United States--Relations--Canada--Congresses.
Princeton subject headings: