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2. Statistical Analysis in Chemistry and the Chemical Industry;Bennett,1954
3. Brant, A. W., and H. L. Shrader, 1952. How to measure egg I. Q. U. S. Dept. of Agr. PA-202.
4. The effect of different diets on interior egg quality;Card;Poultry Sci.,1934
5. The effect of different cereals on feed efficiency, egg quality and shell thickness;Griminger;Poultry Sci.,1954