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2. Application of specific gravity to the determination of egg shell thickness;Arscott,1961
3. The nutritive value of rapeseed meal, soya bean meal and peas for laying hens;Askbrant;Swed. J. Agric. Res.,1984
4. OfficialMethods of Analysis;Association of Official Analytical Chemists,1975
5. Experimental Design;Cochran,1958