Columbia subject headings:
Science--Societies, etc.--Canada--Directories.
Science--Societies, etc.--United States--Directories.
Technology--Societies, etc.--Canada--Directories.
Technology--Societies, etc.--United States--Directories.
Harvard subject headings:
Science--Canada--Societies, etc.--Directories.
Science--United States--Societies, etc.--Directories.
Technology--Canada--Societies, etc.--Directories.
Technology--United States--Societies, etc.--Directories.
Princeton subject headings: