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aja California, 2. The Buried 
inces of Raisz (1964) are sketched. 1. 
Ranges, 3. Western Sierra Madre, 4. Basin and Ranges, 5. Central Mesa, 6. Eastern Sierra Madre, 7. Gulf Coast Lowlands, 8. Neovolcanic Plateau, 
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Figure 1. Shaded relief image of Mexico. The | 
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9. Southern Sierra Madre, 10.Chiapas - Guatemala Uplands, 11. Yucatan. Approximate scale, 1