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| PC | Philadelphia College |
| LHS | Lowell Historical Society |
| UML | University of Massachusetts Lowell |
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| Abbott (Brothers) Letters [PC] |
| Gilman and Friends Letters |
| Wood (John) Letters [UML] |
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| Adams, Phineas G. 1833 05 10 [UML] |
| Bradford, James C. 1839 08 03 [UML] |
| French, George 1849 03 25 [UML] |