Mann, L. M. Notes (1) on Two Tribula or Threshing-Sledges, Having Their under Surfaces Studded With Rows of Chipped Flints, for Threshing Corn on a Threshing-Floor, from Cavalla in European Turkey, Now Presented to the Museum; And (2) on Primitive Implements and Weap. PSAS 1904, 38, 506-519.