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Kossila, V. and Heliander, K. 1969. Simple and partial correlations between the epithelial tissue content of the thyroid, the body weight, age, and level of milk yield in Ayrshire cows. Agricultural and Food Science. 41, 3 (Sep. 1969), 154–159. DOI:https://doi.org/10.23986/afsci.71735.