The Library of Congress Subject Headings (Big Red Books) are used in Chemistry/Biology 301 to help find subject terms.
Use the Appropriate letter for the topic you are searching in the "Individual PDF Files: By Beginning Letter"
You may be cross references to the actual subject term from this entry.
For example: Searching "Pain relievers" in the P's will redirect users to the A's for Analgesics, i.e. USE Analgesics
You can browse through the "Big Red Books" in the Reference Section (2nd Floor), Call Number Z695 L695 2012 or online from the Library of Congress website by following the link below.