Wilmot-Horton, R. J. S. B., Walsh, J. E., & London Mechanics' Institution. (1831). Lecture IV: Delivered at the London Mechanics' Institution, on the 19th of January, 1831: being the fourth of a series of lectures on statistics and political economy, as affecting the condition of the operative and labouring classes. With notes. published for the benefit of the London Mechanics' Institution, by Edmund Lloyd. Sold also at the London Mechanics' Institution.

Wilmot-Horton, Robert John Sir Bart., et al. Lecture IV: Delivered at the London Mechanics' Institution, on the 19th of January, 1831: Being the Fourth of a Series of Lectures on Statistics and Political Economy, as Affecting the Condition of the Operative and Labouring Classes. With Notes. published for the benefit of the London Mechanics' Institution, by Edmund Lloyd. Sold also at the London Mechanics' Institution, 1831.