Kehl, G.L., The Principles of Metallographic Laboratory Practice, 3rd Ed., 1949. 2. Güleç,K., Malzeme Ders Notlan, Makina Fakültesi, LTÜ. 3. References 1 Kehl GL The Principles of Metallographic Laboratory Practice 3rd Ed from ENGINEERIN 215075713 at University of Johannesburg.Principles of Metallographic Laboratory Practice - Third Edition (Metallurgy and Metallurgical Engineering Series) by Kehl, George L. and a great selection Series Title: Metallurgy and metallurgical engineering series. Responsibility: by George L. Kehl. Toggle expanding/contracting information section Reviews. The principles of metallographic laboratory practice by George Louis Kehl, 1949, McGraw-Hill edition, in English - 3d ed. Principles of Metallographic Laboratory Practice book. Read reviews from world's largest community for readers. The Principles of Metallographic Laboratory Practice · G. L. Kehl · Published 1 June 1949 · Materials Science.