Word: sediment
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Dates: during 1930-1939
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...produce methane (marsh) gas. Twenty pounds of pulped debris will develop 100 cu. ft. of gas, enough to light and heat the average farm house for a day. Corn stalks from 40 acres will give a winter's supply of gas. After the gas is exhausted the sediment in the tank can be purified and made into paper.-Illinois' Arthur Moses Buswell...