Edited with David Gabai and Steven P. Kerckhoff.

Click here for the website and the .pdf file.

Edited with Richard Hain and Eduard Looijenga,

Volume 20, 2013.

Edited with David Fisher.

Princeton University Press, 2012.

Click here for the website and the .pdf file.

Click here for the .pdf file.

This is a (June 2006) version of a book that appeared as

It is the final online version. 402 pages.

(book with R.K. Dennis), Graduate Texts in Mathematics 144,

270 pages, Springer, New York, 1993.