1. Standard D1060-56. ‘Core Sampling of Raw Wool in Packages for Determination of Percentage of Clean Wool Fibre Present’, 1956, American Society for Testing Materials : Philadelphia.
2. C. A. Baker and R. T. McAndrew. U.S.P. 2,821,086.
3. G. Le Compte and R. H. Keller. ‘Pressure Core Sampling of Greasy Wool for clean Fiber Determinations’, U.S. Department of Agriculture Publication A.M.S.—55.
4. G. A. Bell and J. Lobb. ‘Sharpening Microtome Knives’, National Standards Laboratory Circular No. 1, 1958 (C.S.I.R.O. Sydney, Australia).
5. E. H. Salmon. ‘Materials and Structures’, 1953, Vol. 1, p.454, Longmans Green : London.