The New Encyclopaedia Britannica: Suppl, Volume 16Encyclopaedia Britannica, 1997 |
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Page 220
... quartz , and other materials used in construction . Agriculture . Although it is predominantly an agricul- tural area , and despite the fact that the per capita land- holding is much larger than the national mean , output of food grain ...
... quartz , and other materials used in construction . Agriculture . Although it is predominantly an agricul- tural area , and despite the fact that the per capita land- holding is much larger than the national mean , output of food grain ...
Page 574
... quartz veins , which were the source of the placer gravels that gave rise to an active colonial mining economy . Beyond Antioquia the lower , remote San Lucas Mountains extend northward toward the confluence of the Magdalena and Cauca ...
... quartz veins , which were the source of the placer gravels that gave rise to an active colonial mining economy . Beyond Antioquia the lower , remote San Lucas Mountains extend northward toward the confluence of the Magdalena and Cauca ...
Page 670
... quartz sand , for example , may be naturally deficient in calcium , magnesium , and other elements essential to plant growth . The surface layers of those soils developed in humid , forested regions are often heavily leached , as rain ...
... quartz sand , for example , may be naturally deficient in calcium , magnesium , and other elements essential to plant growth . The surface layers of those soils developed in humid , forested regions are often heavily leached , as rain ...
Contents
CHINA | 36 |
CHINESE LITERATURE | 231 |
CHORDATES CHRISTIANITY | 251 |
Copyright | |
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