00795cam a22002291 4500 gs 20000378 DLC 20260227111324.0 750430s1920 xx 000 0 eng gs 20000378 (OCoLC)1306266 DLC NhD DLC premarc TN26 .A35 no. 31 McLennan, John Cunningham, 1867- Report on some sources of helium in the British empire, by J. C. McLennan and associates. Pub. by permission of the British Admiralty. Ottawa, J. de L. Taché, printer, 1920. viii, 72 p. 4 fold. maps (in pocket) 25 cm. Canada. Mines Branch. Bulletin no. 31 At head of title: Canada. Department of mines. Helium. 26032 26032