Discursos leídos ante la Real academia española en la recepción pública del excmo. sr. d. Armando Palacio Valdés, el día 12 de diciembre de 1920.

Cover title.

The laws of gravitation; memoirs by Newton, Bouguer and Cavendish, together with abstracts of other important memoirs.

Bibliography: p. 145-156.

A history of the mathematical theories of attraction and the figure of the earth from the time of Newton to that of Laplace.

Available on demand as hard copy or computer file from Cornell University Library.

"Some of the boys ..." The Civil War letters of Isaac Jackson, 1862-1865.

Mode of access: Internet.

Correspondence of scientific men of the seventeenth century : including letters of Barrow, Flamsteed, Wallis, and Newton, printed from the originals in the collection of the Right Honourable the Earl of Macclesfield.

Microfilm. Ann Arbor, Mich., University Microfilms [n.d.] (American culture series, Reel 275.3)

Letters of Isaac Penington : son of Alderman Penington of London, and an eminent minister of the gospel in the Society of Friends, which he joined about the year 1658.

Mode of access: Internet.

Isaac H. Bromley,

Mode of access: Internet.

The geology of the country around Newton Abbot /

"Explanation of sheet 339."