Columbia subject headings:
Harvard subject headings:
Biology--Information services--Handbooks, manuals, etc.
Information storage and retrieval systems--Biology--Handbooks, manuals, etc.
Subject headings--Biology--Handbooks, manuals, etc.
Princeton subject headings:
Biology--Information services--Handbooks, manuals, etc.
Information storage and retrieval systems--Biology--Handbooks, manuals, etc.
Subject headings--Biology--Handbooks, manuals, etc.