Ramfjord, Sigurd Peder, 1911-, Occlusion / Sigurd P. Ramfjord, Major M. Ash. - Second edition. - Philadelphia : W. B. Saunders, 1971. - 427 pages : illustrations ; 27 cm. ISBN: 0721674410 Subjects--Topical Terms: Maloccclusion.Occlusion (Dentistry).