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  1. By: Hoopes, Abner
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    Subjects: 1809-1884  1836-1920  Coniferae  Correspondence  Engelmann, George,  Hoopes, Abner  Letters  
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  2. By: Keilhack, Konrad,
    Publication info: Berlin, Im Vertrieb bei der Preussischen Geologischen Landesanstalt, 1921
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: 1836-1920  Berendt, Gottlieb Michael,  Bibliography  Biography  Geologists  Germany