Gems and gem materials
Kraus, Edward Henry
Gems and gem materials - 5th ed. - New York: McGraw Hill Book Company Inc., 1947 - ix, 332p.
Gems
Materials
549 / H7
Gems and gem materials - 5th ed. - New York: McGraw Hill Book Company Inc., 1947 - ix, 332p.
Gems
Materials
549 / H7