The textbook , authored by Major M. Ash and Sigurd P. Ramfjord , is a seminal work in dental education that bridges the gap between the biological mechanisms of the body and the functional principles of dental occlusion. Originally published in 1966, it has undergone several revisions, with the 4th edition (1995) being a widely cited standard. Core Principles of the Work

Here is the information regarding this specific book and clarification on the "PDF 58" part of your query.

: The book has gone through several revisions, including the 3rd edition (1983) and the 4th edition (1995).