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| 1996 | ||
|---|---|---|
| 1 | 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 | Lois F. Kelso | [1] |
| 3 | Ruth A. Ross | [1] |
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