Smith P. L., Haslett A. W. [. o. c., . (1929). Science to-day. [London: Blackie and Son Ltd.
Smith P.J Lancelot, Haslett Arthur Woods [from old catalog], . 1929. Science to-day. [London: Blackie and Son Ltd.
Smith P.J Lancelot, Haslett Arthur Woods [from old catalog], . Science to-day. [London: Blackie and Son Ltd. 1929.