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| ATHM | American Textile Museum |
| HU | Harvard University |
| LHS | Lowell Historical Society |
| UML | University of Massachusetts Lowell |
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| Austin (William) Letters [HU] |
| Ayer (James) Letters [LHS] |
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| Batchelder, Samuel 1826 12 06 [LHS] |
| Clark, John 1847 27 07 [LHS] |
| Lawrence, Samuel 1847 06 [ATHM] |
| Palfrey, John Carver 1865 11 08 [UML] |
| Swasey, Nauman G. 1852 03 07 [LHS] |