The physical book and journal collections for Physics and Astronomy are located on the 3rd floor of the Science Library (the DMS Watson building). The 3rd floor of the Science Library holds all the physical collections for departments within the Maths and Physical Sciences Faculty.
The library catalogue (called Explore) is the principal tool to find books, journals and other materials (either in print or in electronic format) held in UCL libraries. On the catalogue, you will find the details with the details of the location of the materials you are looking for: library site, collection and shelfmark.
Some other collections you may find useful are:
ReadingLists @UCL is an online service that gives students easy access to materials on their reading lists wherever they are, and allows academic staff to create and update their own reading lists.