Alford, L. P. (1924). Duplicate and interchangeable manufacture. Industrial Extension Institute.
Cita Chicago Style (17a ed.)Alford, Leon Pratt. Duplicate and Interchangeable Manufacture. New York: Industrial Extension Institute, 1924.
Cita MLA (9a ed.)Alford, Leon Pratt. Duplicate and Interchangeable Manufacture. Industrial Extension Institute, 1924.
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