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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Emerson, Paul,
    Publication info: Ames, Iowa, 1918
    Holding Institution: Library of Congress
    Subjects: Azotobacter  Soil inoculation  Soil microbiology  
  2. By: Johnson, Harlan Woodbridge, - Lipman, C. B. (Charles Bernard),
    Publication info: Berkeley, University of California press, 1922
    Holding Institution: University of California, Davis Libraries
    Subjects: Azotobacter  Nitrification  Soil microbiology