Columbia subject headings:
Agriculture--Societies, etc.--Directories.
Engineering--Societies, etc.--Directories.
Science--Societies, etc.--Directories.
Harvard subject headings:
Agricultural societies--Directories.
Engineering--Societies, etc.--Directories.
Science--Societies, etc.--Directories
Princeton subject headings:
Agricultural societies--Directories.
Directories.
Engineering--Societies, etc.--Directories.
Science--Societies, etc.--Directories.