Methods and conditions change, and in a few years the soil has been depleted of its fertility. Perhaps the newly cleared larxd was tilled in corn for three...
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1896년
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다운로드다국어 초록 (Multilingual Abstract)
Methods and conditions change, and in a few years the soil has been depleted of its fertility. Perhaps the newly cleared larxd was tilled in corn for three...
Methods and conditions change, and in a few years the soil has been depleted of its fertility. Perhaps the newly cleared larxd was tilled in corn for three, or four seasons, then in wheat a year or two and back to corn again, as long as the soil would produce a fair crop. About how many years would a good...