ਜਨ 1936 · U.S. Department of Agriculture, Soil Conservation Service
ਈ-ਕਿਤਾਬ
16
ਪੰਨੇ
ਇਸ ਈ-ਕਿਤਾਬ ਬਾਰੇ
The conservation farming practices discussed here are a few of those found by experience and investigation to be effective in erosion control and which promise, accordingly, substantial aid to upstream flood control and soil protection.