T10.5-11.9 is the primary call number range for subjects in technical writing. This will cover most aspects of technical writing, though you may need to look at other sections for scientific or business writing.
T10.5-11.9 Communication of Technical Information
You may also try Q, P, or H sections for other material about science writing, composition, and business writing, 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.