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Letter: Belle Knowles to Department of Geological Survey
Letter: Belle Knowles to Editor, Boston Evening Transcript
Letter: Belle Smallidge Knowles to Addie L. Harvey (2)
Letter: Belle Smallidge Knowles to Allen Chamberlain (2)
Letter: Belle Smallidge Knowles to Charles C. Adams
Letter: Belle Smallidge Knowles to Ezra H. White
Letter: Belle Smallidge Knowles to Frank E. Guernsey (7)
Letter: Belle Smallidge Knowles to Frank L. Merritt
Letter: Belle Smallidge Knowles to Grace A. Wing (3)
Letter: Belle Smallidge Knowles to Jennie R. Goodall (2)
Letter: Belle Smallidge Knowles to John A. Peters
Letter: Belle Smallidge Knowles to Lucius H. Merrill (2)
Letter: Belle Smallidge Knowles to Mrs. Scott West
Letter: Charles C. Adams to Belle Smallidge Knowles
Letter: Charles C. Adams to Grace A. Wing
Letter: Frank E. Guernsey to Belle Smallidge Knowles (3)
Letter: Frank L. Merritt to Belle Smallidge Knowles
Letter: John A. Peters to Belle Smallidge Knowles (2)