• publisher: Oberlin : The College
  • creator: Hadfield, Robert A. (Robert Abbott), 1858-1940 Williams, S. R Bowen, L. S
  • contributor: Williams, S. R. Bowen, L. S.
  • years: 1920.
  • pages: 297-302 p. ;
  • class: TA479.M3
  • notes: From the Proceedings of the Royal Society, A. vol. 98 (1920).
  • download: pdf file