Template:Colvin1947
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Colvin, Fred H. (1947), Sixty Years with Men and Machines, New York and London: McGraw-Hill, LCCN Expression error: Unrecognized punctuation character "[". 47-Expression error: Unrecognized punctuation character "[".Template:Only in print. Available as a reprint from Lindsay Publications (ISBN 978-0-917914-86-7). Foreword by Ralph Flanders.