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.
If you know the title of the article you need, you can enter it directly in the Explore search box. If UCL Libraries have an electronic subscription to the journal in which the article is published, this will appear in your results list and you can download the full-text following the instructions provided. The same applies if you're looking for a journal article using one of the many article-specific UCL Databases.