Two Volumes Mining Metallurgy and Geology Interest: Kerogen, Insoluble organic Matter from sedimentary Rocks- Isbn 2710803712, B Durand, Hardback, Dustjacket, Institut Francais du Petrole, 1980 Editions Technip, Paris, as new, Owners Name on Blank end & rare earth element Geochemistry (Developments in Geochemistry 2)- Isbn 0444421483, P Henderson, 510 Pages, Hardback, Department of Mineralogy,British Museum (natural History), London, Elsevier Science Publishers, Slight Crease Frh cover