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O Horizon : occurring commonly in forest areas. Such O Horizon is visible in virgin soils and absent in arable soils.
3 6 18 149 602 15057
...112, 119, 133, 154, 180, 217
11, 12, 20, 58, 234, 1168
3, 4, 9, 28, 116, 566, 3397
2, 20, 40, 64, 98, 144
12, 23, 35, 47, 59, 73
98, 128, 162, 200, 244, 288
2, 6, 44, 462, 6930, 131670
132, 130, 136, 126, 142, 110
