Columbia subject headings:
Harvard subject headings:
Ecological engineering--Vocational guidance--Canada--Handbooks, manuals, etc.
Ecological engineering--Vocational guidance--United States--Handbooks, manuals, etc.
Environmental sciences--Vocational guidance--Canada--Handbooks, manuals, etc.
Environmental sciences--Vocational guidance--United States--Handbooks, manuals, etc.
Universities and colleges--Canada--Directories.
Universities and colleges--United States--Directories.
Princeton subject headings:
Environmental sciences--Study and teaching (Higher)--Canada--Directories.
Environmental sciences--Study and teaching (Higher)--United States--Directories.
Environmental sciences--Vocational guidance--Periodicals.