| Holt Research Forest Annual Tree Seed Collection | Participant | 1983-05-01 | Ongoing |
| Holt Research Forest Tree Seedling Counts, 1m2 Plots | Participant | 1986-05-01 | 2017-05-01 |
| Holt Research Forest Timber Inventory | Participant | 1984-01-01 | Ongoing |
| Holt Research Forest Basic Documentation | Participant | 1983-01-01 | Ongoing |
| Holt Research Forest Salamander Counts and Measurements | Participant | 1987-01-01 | Ongoing |
| Holt Research Forest Salamander Stations Timber Inventory | Participant | 1994-01-01 | Ongoing |
| Holt Research Forest Small Mammal Stations Timber Inventory | Participant | 1986-05-01 | Ongoing |
| Holt Research Forest Understory Releve, 1m2 plots | Participant | 1993-01-01 | Ongoing |
| Holt Research Forest Understory Releve, S1 Lines | Participant | 1986-01-01 | Ongoing |
| Holt Research Forest Understory Releve, Subquadrats | Participant | 1985-01-01 | Ongoing |
| Holt Research Forest Oak Seedling Survey | Participant | 2011-01-01 | Ongoing |
| Holt Research Forest Sapling Mapping, S10 Lines | Participant | 1986-01-01 | Ongoing |
| Holt Research Forest Tree Heights, Estimated and Measured | Participant | 1984-01-01 | Ongoing |
| Holt Research Forest Crown Measurements, S10 Plots | Participant | 1989-01-01 | 1991-01-01 |
| Holt Research Forest Tree Regeneration | Participant | 1984-01-01 | Ongoing |
| Holt Research Forest Tree Volume | Participant | 1984-01-01 | Ongoing |
| Continued long-term ecological monitoring in a northern red oak-white pine research forest over five decades | Participant | 2023-06-01 | 2024-08-01 |
| Holt Research Forest Fern Observations | Primary Contact | 2000-09-26 | 2024-09-13 |
