1. Proc. Amer. Soc. Test. Mat., 1903, Part III, 349
2. : Proc. Amer. Soc. Test. Mat., 1927, Part II, 480.
3. A NOTE IN THE CONCEPT OF BRITTLENESS1
4. : J. Amer. Asphalt Paving Technologists, January 1932, 71.
5. Directions for the Determination of Impact Strength of Composite and Fibrous Insulating Materials, E.R.A. Report Ref. A/S36, 1937.