One of the most notable collections of physics monographs available online is the Lecture Notes in Physics series. This can be found in full text through Springer at Lecture Notes in Physics. In addition to Lecture Notes in Physics, many other electronic books are available online through Springer Link.

If you prefer a more general search for Electronic books in Physics, you may want to try the E-Books search feature in the Library Catalog. An easy and effective search may be the keyword "Physics". The results in the catalog will be linked directly to their electronic form.