Timeline
| 1792 | Ebenezer Wood born |
| 1812 | William Munroe starts manufacturing pencils |
| 1817 | Henry David Thoreau born |
| 1821 | Charles Dunbar discovers graphite deposit in New Hampshire |
| 1823 | John Thoreau starts working with Dunbar |
| 1830s | Wood's mill starts grinding plumbago exclusively for the Thoreau's |
| 1837 | Henry David Thoreau returns to Concord from Harvard University |
| 1862 | Henry David Thoreau dies |
| 1880 | Ebenezer Wood dies |
| 1987 | Nashoba Brook Conservation Area opens |
| 1990 | Robbins Mill Pond Dam renovated |
| 1999 | Jeff LeBlanc builds site kiosk for Eagle Scout project |
Read more about this topic: Nashoba Brook Pencil Factory Site