Columbia subject headings:
Dissertations, Academic--Abstracts.
Engineering--Abstracts.
Horticulture--Abstracts.
Science--Abstracts.
Harvard subject headings:
Princeton subject headings:
Abstracts.
Dissertations, Academic--Abstracts--Periodicals.
Engineering--Abstracts--Periodicals.
Horticulture--Abstracts--Periodicals.
Periodicals.
Science--Abstracts--Periodicals.