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Ladeburg, R. C., R. H. Larson and J. C. Walker. 1950. Origin, interrelation and properties of ringspot strains of potato virus X in American potato varieties. Wis. Agr. Exp. Sta. Res. Bull. 165.
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On leave of absence from Max Planck Institut fur Zuchtungsforschung, Koln-Vogelsang, German Federal Republic.
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Hansen, A.J., Larson, R.H. The occurrence of the brownspot strain of potato virus X. American Potato Journal 34, 6–9 (1957). https://doi.org/10.1007/BF02854859
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DOI: https://doi.org/10.1007/BF02854859