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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, Walter R. (Walter Rogers),
    Publication info: Philadelphia, William P. Gibbons, 1835
    Holding Institution: Harvard University Botany Libraries
  2. By: Smithson, James, - Rhees, William Jones, - Johnson, Walter R. (Walter Rogers), - Irby, John Robin McDaniel,
    Publication info: Washington, Smithsonian institution, 1879
    Holding Institution: University of California Libraries