- 1Martin J. Gavin
Oil-shale : an historical, technical, and economic study
Denver (CO): The Bradford-Robinson printing co 1922; xii, 201 p. : 1 ill., 18 pl. (5 fold.) on 15 l. (incl. 2 fold. plans, 2 fold. diagr.) tables (1 fold.) diagrs. (2 fold.)
Ölschiefer - 2Ralph Harper McKee
Shale oil
New York (City): Chemical catalog company 1925; 326 Seiten; Ill., graph. Darst.
Ölschiefer