For each minor planet: Where and when found, and by whom.

Mathematical discovery of planets

The development of the mathematics of planetary motion.

Timeline of Lunar exploration.

The five known in antiquity, three more since the telescope, and Ceres.

Article in Astronomy Magazine.

A. R. Wallace's 1907 critique of Lowell's Book "Mars and Its Canals"

A catalog for an exhibition of rare books and maps. Includes sample pictures from Galileo to the Apollo missions.

On-line version of the book by William Sheehan.

A paper by Clyde Tombaugh relating his discovery of Pluto.