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It is easy to imagine that these investigators are seen by the judge or jury as less credible than if this important information had been documented . In the blackland areas , nitrogen and phosphorus may not be adequate for good turf development . Recent research shows that the returns to investment in skills upgrading of less educated workers are three times as great as for investment in physical capital . A fall of 6 inches for every 40 to 50 surface feet is adequate for drainage on sandy soils , provided no pockets or depressions exist . Rochelle offered to talk to Prof. Lewis and others familiar with Visual Basic for the texts to be used for such a course . Performed are improvement in capability of an administration committee for commune natural resource in this division , activity strengthening of an execution team of the law for poaching , community ranger program , etc. For example , 300 pounds of plant residue may be adequate for a semi-arid area with short-grass vegetation , while 1,200 pounds of residue may be required in a more humid area with tall-grass vegetation .