A Textbook of Oral Pathology. Shafer, Hine and Levy. W. B. Saunders Co. Fourth Edition, 1983. The standard text in the field. Unfortunately it has not undergone a major revision in years.
Pictures are adequate, but relatively sparse.
In the meantime, copies can be found in our library and in the hands of current and former students. With the past unavailability of Shafer, this book seems to have moved into first place. The classification generally follows that used in the course. The author made a valiant attempt to organize this text according to clinical appearances of lesions. However, the text is very weak and the author has created an organizational nightmare as some lesions appear in many places.