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For 1967 comparative data see Amer. Potato J. Vol. 45: 189–193. (May 1968)
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Turnquist, O.C. Production of certified seed potatoes by varieties—1968. American Potato Journal 46, 214–218 (1969). https://doi.org/10.1007/BF02863049
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DOI: https://doi.org/10.1007/BF02863049