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  1. A contribution to the investigation of the assimilation of free atmospheric nitrogen by white and black mustard /
    By: Lotsy, Johannes Paulus, - United States. Office of Experiment Stations.
    Publication info: Washington :U.S. G.P.O.,1894.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Assimilation  Mustard  Nitrogen  Plants  
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  2. Wild mustard
    By: British Columbia. Dept. of Agriculture.
    Publication info: Victoria, B.C. :R. Wolfdenden,1903.
    Holding Institution: (
    Subjects: Control  Mustard  Weeds  
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