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For a country accustomed to counting its resources in millions, or even billions, the unit of measure is almost too small to be of interest. But during a lunch break one day, Robert E. Hardwicke asked of his colleagues in the Petroleum Administration for War why American oil is measured by the 42-gallon barrel and no other. Why not 30, 36, or an even 50? No one present had the answer, but a dozen years later, and after extensive research, Hard...

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.