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| Letter from D. M. P. Davis to Increase Allen Lapham, June 13th | No notes |
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| Letter from George W. Clinton to Increase Allen Lapham, June 17th | No notes |
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| Letter from William T. Henry to Increase Allen Lapham, June 23rd | No notes |
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| Letter from J. R. Woodworth to Increase Allen Lapham, July 10th | No notes |
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| Letter from William Hiet to Increase Allen Lapham, July 24th | No notes |
| Letter from George Engleman to Increase Allen Lapham, July 29th | No notes |
| Letter from William T. Henry to Increase Allen Lapham, July 28th | No notes |
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| The So Called 'Marble' of Sauk County | No notes |
| Notes on a Quarry near top of bluff of Mazomanie | No notes |
| Letter from G. G. Parry to Julia A. Lapham, August 19th | No notes |
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| Letter from F. K. Phoenix to Increase Allen Lapham, August 26th | No notes |
| Letter from Edouard Desor to Julia A. Lapham, September 3rd | No notes |
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| Letter from Wyman Spooner to Increase Allen Lapham, October 20th | No notes |
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| Letter from John M. Bigelow to Increase Allen Lapham, October 31th | No notes |
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| Letter from William Franklin Raynolds to Increase Allen Lapham, November 15th | No notes |
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| Letter from Charles Hilton to Increase Allen Lapham, November 23rd | No notes |
| Empire Coal Company Business Proposal | No notes |
| Letter from Increase Allen Lapham to John G. Hilton, November 24th | No notes |
| Letter from J. P. Lesley to Increase Allen Lapham, November 30th | No notes |
| Letter from Jasper Macalister to Increase Allen Lapham, December 15th | No notes |
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| Letter from Jasper Hewite to Julia A. Lapham | No notes |
| List of Contributions to the Department of Geology and Natural History | No notes |
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| Officers of the New England Historic-Genealogical Society for the Year 1865 | No notes |
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