LBIS HHMI Summer 2000 for all headings and subheadings - close with .
Most disciplines have subject-specific reference works.
You should use these sources to provide an overview or introduction to an issue, event, person or a phenomena. These are also helpful in gathering keywords for your search. These are a good place to start to narrow or broaden a topic. You can then examine the records to see if there are specific subject headings that would lead you to other relevant items in the catalog. An interdisciplinary index, Periodical Abstracts includes citations and abstracts for over 1,800 popular and academic periodicals.