All UR library books are "classified" with Library of Congress (LC) "call numbers." Call numbers are the letters and numbers found on the spine of the book that tell you where the book is located on the shelf. They also tell you what subject area the book covers.
The majority of the science collection falls into the Q, R, S, and T call numbers area. The call numbers also group the books hierarchically:
E.g. Call #s beginning with Q = general science; QA = math; QB = astronomy; QC = physics; QD = chemistry; QK = botany; QL = zoology; R = medicine; S = agriculture; T = technology.
If you were looking for a book on inorganic chemistry, it would be found in the call # range QD146-197.
Most academic libraries use the LC classification system. If you are looking for the book Basic Principles of Inorganic Chemistry: Making the Connections by Brian Murphy in Boatwright Library, the catalog tells you the call # is QD151 .M859 1998. You could find the same book with the same call number if you visited the libraries at Harvard, Yale, UNC, Duke, Princeton, or Stanford!
The first place to check for books on your topic is the UR Library Catalog. Here are some quick tips for effective catalog searches:
Books are assigned at least one subject heading. E.g. If you look at the catalog record for the book Smart Solutions to Climate Change: Comparing Costs and Benefits by Bjorn Lomborg, you will see that it is assigned 3 subject headings:
You can click on any of these subject headings that can link you to other books in the catalog. Subject headings will often lead you to books that you would not be able to find if searching by keyword only!