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| 1. | Walschburger. Los Andes. |
| 2. | Kley. Die zentralen Anden:geologische Strukturen eines aktiven Ko... |
| 3. | Clawson. Forks in the road:Raymond E. Crist and geographical fiel... |
| 4. | Usselmann. Un acercamiento a las modificaciones del medio físico... |
| 5. | Bushong. Raymond E. Crist:a biographical essay. |
| 6. | Denevan. Prehistoric roads and causeways of lowland tropical Amer... |
| 7. | Seminario Andino de Riego Parcelario(1988 :Riobamba. Seminario An... |
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