English IX, 4. described at URL: https://en.wikisource.org/wiki/Index:How_To_Learn_Easily_(Dearborn).djvu...
per 1,000 watt-hours was between 4:2c. and 4°54c. Deducting the cost of coal, which was from 1°26 to 1°86c., the sum of the other expenses was...
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