Herbert John Webber,
Some facts concerning the New York State College of Agriculture at Cornell University…
(1915)
“ In connection with the farm management investigations of the College, some very suggestive evidence has been secured showing the money value of education in farming. In a number of townships all of the farms were visited and accurate data obtained from the farmer showing his income from his own labor. In deriving the farmer's labor income, from the gross receipts there were deducted all expenses, including those for labor other than that of the farmer himself, five per cent, interest on capital invested and a charge for depreciation in apparatus, tools, etc. ”
