20681. Faessler, C.   Le Granite Preanorthosite de la sous-province de Grenville, partie quebecoise.   University of Laval, 1943, Naturaliste Canadian, 70 : 97-138, 8 figures.   Printed wraps, minor signs of use and age discoloration, very good condition.   Geologie et Mineralogie Contribution No. 52 in French-Canadian.   $16.00

20682. Faessler, C. and Tremblay, L. P.   Perthite as Age Indicator in Laurentian Gneiss and Pine Hill Intrusives.   University of Laval, 1946, Canadian Mining and Metallurgical Bulletin, 405 : 58-70, 8 figures.   Printed wraps, previous owner marks on front wrap, minor signs of use and age discoloration, very good condition.   Geologie et Mineralogie Contribution No. 67 in English.   $5.00