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A rudimentary treatise on the steam engine, 1848: t.p. (Dr. Lardner; editor of The cabinet cyclopeadia) front cover (LL.B)
BL database, viewed 23 March 2017: (hdg.: Lardner, Dionysius; Lardner, Dr.; Lardner, D.; usage: Dionysius Lardner, Dr. Lardner)
Wikipedia, viewed 23 March 2017: Dionysius Lardner (born Dublin, 3rd April 1793; died 29 April 1859; professor of natural philosophy and astronomy at University College Dublin; wrote treatises on geometry, calculus and the steam engine)