James Pollard Espy, Alfred Osborn Pope Nicholson (1857). “Message from the President of the United States: Communicating, in Compliance with a Resolution of the Senate of July 24, 1854, the Fourth Meteorological Report of Prof. James P. Espy”, p.40
John Flavel (1840). “Divine Conduct: Or, The Mystery of Providence, Wherein the Being and Efficacy of Providence are Asserted and Vindicated ... and the Proper Course of Improving All Providences Pointed Out”, p.19