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  1. By: Peters, C. H. F. (Christian Heinrich Friedrich), - Frost, Edwin Brant,
    Publication info: Washington, D.C, Carnegie Institution of Washington, 1907
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Sunspots
  2. By: Douglass, A. E. (Andrew Ellicott),
    Publication info: Washington, Carnegie Institution of Washington, 1919-1936
    Holding Institution: Duke University Libraries
    Subjects: Climatology  Meteorology  Periodicity  Sunspots  Tree-rings