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Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
A nice introduction into nonlinear dynamics with many Java applets.
Textbooks
R.H. Abraham and C.D. Shaw:Dynamics: The Geometry of Behavior,
(4 volumes), Aerial Press, 1982-88.
Beautiful picture books.
G.L. Baker and J.G. Gollub:Chaotic dynamics -- an introduction,
Cambridge University Press, 1990, (2.ed) 1996.
An elementary introduction where the pendulum driven by a periodic force
is the central thread. With listings of computer programs.
P. Bergé, Y. Pomeau und Ch. Vidal:Order within chaos -- Towards
a deterministic approach to turbulence, John Wiley \& Sons, New York, und
Hermann, Paris, 1986.
A classical introduction into nonlinear dynamics from the viewpoint of physics.
J. Guckenheimer and Ph. Holmes:Nonlinear Oscillations, Dynamical
Systems, and Bifurcations of Vector Fields, Springer-Verlag, 1983.
A classical and readable textbook about the mathematical aspects
of nonlinear dynamics.