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| Date: | 10 1827 |
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| Description: | Open spread of Increase Lapham's diary from October 6, 1827 to April 18, 1828. |
| Date: | 1828 |
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| Description: | Open spread of Increase Lapham's diary. |
| Date: | 1835 |
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| Description: | Page from Increase Lapham's 1935 botanical diary in which he listed plants he observed in flower stage. |
| Date: | 1838 |
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| Description: | Page from Increase Lapham's 1838 botanical diary in which he listed plants he observed in flower stage. |
| Date: | 1870 |
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| Description: | Page from a diary kept by Increase Lapham in California between April 11 and May 19, 1870. The page shows a portion of a list of minerals of California. |
| Date: | 07 22 1827 |
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| Description: | Letter from Benjamin Sillman to Increase Lapham requesting information about the canal around the rapids of the Ohio River for inclusion in The Journal ... |
| Date: | 1849 |
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| Description: | Handwritten list of plants in the Ranunculaceae or crowfoot family. |
| Date: | 1845 |
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| Description: | Page from Increase Lapham's 1845 list of plants of Wisconsin including Oxalidaceae, Zanthoxylaceae, and Anacardiaceae and notations of where and when indiv... |
| Date: | 1844 |
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| Description: | Increase Lapham's handwritten title page for A Geographical and Topographical Description of Wisconsin |
| Date: | 1838 |
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| Description: | Title page of Increase Lapham's Catalog of Plants Found in the vicinity of Milwaukee, Wisconsin Territory. |
| Date: | 01 13 1937 |
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| Description: | Sketch map of Township 7 North, Range 9 East, created for the Land Economic Inventory (Bordner Survey). The map shows Picnic Point and the Lake Mendota sho... |
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