Columbia subject headings:
Harvard subject headings:
Dissertations, Academic--United States--Abstracts--Periodicals.
Northwestern University (Evanston, Ill.)--Dissertations--Abstracts--Periodicals.
Princeton subject headings:
Abstracts.
Dissertations, Academic--United States--Abstracts--Periodicals.
Northwestern University (Evanston, Ill.)--Dissertations--Abstracts--Periodicals.
Periodicals.