You will find starting points for finding primary materials (manuscripts, archives, images, etc.), books and book chapters, articles from journals, and online resources for the history of physics. History of physics materials may be found in the more general resources for the history of science, so several of the resources cover more than just physics and physicists.
Use the "Can't Find It? link in the catalog to Ask the Library to search for a missing book
TIP: WorldCat is a useful resource for identifying books that are not in the University of Chicago Library
Proquest Digital Dissertations is a resource listing dissertations from US and Canada. Some dissertations are available for full text download.
Used/antiquarian book sources on the web: