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19. Scorr, T. AND W. R. BRIGGS. 1960. Auxin relationships in the Alaska pea (Pisunt sativum). Am. J. Botany 47: 492-99. 20. SCOTT, T. AND W. R. BRIGGS. 1962. Recovery of native and applied auxin from the light-grown Alaska pea seedling. Am. J. Botany 49: 1056-63. 21. SHIFRISS, 0. 1961. Gibberellin as sex regulator in Ricunus communis. Science 133: 2061-62. 22. VLITOS, A. J. AND W. MEUDT. 1954. The role of auxin in plant flowering. II. Methods for the extraction and quantitative chemical determination of free 3-indoleacetic acid and other indole compounds from plant tissues. Contrib. Boyce Thompson Inst. 17: 401-11. 23. WESTON, E. W. 1960. Changes in sex in the hop caused by plant growth substances. Nature 188: 81-82. 24. WITTWER, S. H. AND M. J. BUKOVAC. 1962. Staminate flower formation on gynoecious cucumbers as influenced by the various gibberellins. Naturwissenschaften 49: 305-06.

A Comparison of Methods for the Removal of Cobalt and Vanadium from Salts Used in Plant Nutritional Studies