Western Rivermen, the first documented sociocultural history of its subject, is a fascinating book. Michael Allen explores the rigorous lives of professional boatmen who plied non-steam vessels--flatboats, keelboats, and rafts--on the Ohio and lower Mississippi rivers from 1763-1861. Allen first considers the mythical "half horse, half alligator" boatmen who were an integral part of the folklore of the time. Americans of the Jacksonian...