Geology of northwest Shakwak Valley, Yukon Territory /
Bostock, H. S.(Hugh Samuel),1901-
Ottawa : E. Cloutier, Queen's Printer,
1952.
Map & fig. folded in back pocket: Map 1012A at scale 1:253,440 -- Fig. 1 Map showing  distribution of volcanic ash at scale 1:3,800,000.
Bibliography: p. 3-4.
Geology
Petrology
Volcanic ash, tuff, etc.