These are call number subsections you might want to browse for books related to environmental topics:
For a more detailed breakdown of the call number ranges, visit the Library of Congress Classification Outline
If you find a physical book, it will have something called a call number. The call number is like its home address. Copy and paste any call number into the Call Number Locator below to see where it lives in the library.
A call number will look something like this:
SF408.3 .E84 1995