Commercial vegetable plant propagation : a course in connection with the "Beijing vegetable seedling production project" / C. Ploeger, A.J. de Visser
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Commercial vegetable plant propagation : a course in connection with the "Beijing vegetable seedling production project" / C. Ploeger, A.J. de Visser
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Commercial vegetable plant pro ...... e seedling production project"
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Commercial vegetable plant pro ...... " / C. Ploeger, A.J. de Visser