Callum Creek, Langford Creek, and Gap map-areas, Alberta /
Douglas, R. J. W.(Robert John Wilson),1920-1979.
Ottawa : E. Cloutier, King's Printer,
1950.
3 maps & 2 figs. folded in back pocket: Maps 978A, 981A & 982A at scale 1:63,360 -- Fig. 1 & 11.
Bibliography: p. 2-3.
Geology