SENÉCAL, C.-O. Colour Printing of Geological Maps. Ottawa: F.A. Acland. 1925.
8vo. Recent black paper wrapper, paper label to front; pp. 4, 4 colour plates, text diagrams; fine.
First edition. Canada Department of Mines Geological Survey Bulletin No. 39, Geological Series, No. 44. A fascinating pamphlet on the correct desgn and colouring of geological maps.