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Harpp David N, Chan T H & Roberts John D. (1972). Organic chemistry problems. : .
Harpp David N, Chan T H and Roberts John D. 1972. Organic chemistry problems. : .
Harpp David N, Chan T H and Roberts John D. (1972). Organic chemistry problems. : .
Harpp David N, Chan T H and Roberts John D. Organic chemistry problems. : . 1972.