| Author | Popularity |
|---|---|
| Charnley, A.H. | 1 |
| Hammerschmidt, P.C. | 1 |
| Martin, J.H. | 1 |
| National Institute of Adult Education (UK) | 1 |
| Osborn, M. | 1 |
| Osborn, M.F. | 1 |
| Withnall, A.W. | 1 |
| Author | Popularity |
|---|---|
| Charnley, A.H. | 1 |
| Hammerschmidt, P.C. | 1 |
| Martin, J.H. | 1 |
| National Institute of Adult Education (UK) | 1 |
| Osborn, M. | 1 |
| Osborn, M.F. | 1 |
| Withnall, A.W. | 1 |
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