The Royal Society of Chemistry - How to read a journal article on their Higher Education Resources area can help you read and understand journal articles.
Library books are arranged by the Dewey Decimal classification scheme whereby each subject is represented by a number.
You wil find books on the same subject will have the same number. The shelfmark is preceded by the letter D and will be followed by 3 letters, which are usually the first 3 letters of the author's name.
Here are some useful chemistry shelfmarks.
D 543 Analytical Chemistry
D 546 Inorganic Chemistry
D 547 Organic Chemistry
D 574.19 Biochemistry
D 615 Pharmacology and therapeutics
D 660.2 Chemical engineering