1. Walker, G. T. Mem. Ind. met. Dept. 24, 75–131 (1923).
2. Walker, G. T. Mem. Ind. met. Dept. 24, 275–332 (1924).
3. Walker, G. T., Mem, R. met. Soc. II, No. 17, 97–106 (1928).
4. Walker, G. T. & Bliss, E. W. Mem. R. met. Soc. No. 4, 53–84 (1932).
5. Walker, G. T. & Bliss, E. W. Mem. R. met. Soc. No. 4, 119–139 (1937).