| |
| 1996 | ||
|---|---|---|
| 1 | EE | Ruth A. Ross, Lois F. Kelso, Gary R. Broughton, Edward J. Hopkins: Providing Multiple Levels of Difficulty in EarthLab's Digital Library (poster). Digital Libraries 1996: 181 |
| 1 | Gary R. Broughton | [1] |
| 2 | Edward J. Hopkins | [1] |
| 3 | Lois F. Kelso | [1] |