Books Websites

A late edition (1909-14) in the Harvard Classics of the seminal book: "Origin of Species"

A publication of the U.S. Geological Survey by R.J. Litwin, R.E. Weems and T.R. Holtz, Jr.

A publication of the US geological Survey by L.E. Edwards and J. Pojeta, Jr.

The St. Louis Code is the currently effective edition of the code, adopted by the Sixteenth International Botanical Congress at St Louis, Missouri, July-August 1999.

This richly illustrated book authored by John Pojeta, Jr. and Dale A. Springer is available free online by the American Geological Institute. It is one of the most impressive textbooks of the AGI collection.