Q is the primary call number range for subjects in science. Q will cover most aspects of science including natural history, biology, botany, zoology, physiology, and microbiology.
QH1 Natural History
QM Human Anatomy
Physics and Chemistry may be useful and are located in the QC and QD, respectively.
For better targeted browsing, use the catalog to identify several books that relate to your area of interest and look in the library call number sections that contain those books.
Other ebooks from around the web.