Columbia subject headings:
Harvard subject headings:
Dissertations, Academic--Canada--Abstracts--Periodicals.
Dissertations, Academic--Canada--Abstracts.
Dissertations, Academic--United States--Abstracts--Periodicals.
Dissertations, Academic--United States--Abstracts.
Dissertations, Academic.
Princeton subject headings:
Abstracts.
Dissertations, Academic--Canada--Abstracts.
Dissertations, Academic--United States--Abstracts.