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"From 1907 to 1912 Cowboy Park in Ciudad Juarez, Mexico, kept steer roping alive after border states outlawed such contests. Though political turmoil caused the park's closure, its alumni dominated the sport until about 1920. Rodeo history seldom mentioned Cowboy Park. Here are its champions' stories, including photographs, many previously unpublished"--Provided by publisher

Experiments on a CRT driving simulator are used to develop a closed-loop human operator model for straight road driving in the absence of any externally applied disturbance such as side wind gusts or road roughness. It is shown that a significant portion of the driver's control characteristics can be represented by a stationary, nonlinear system with a single visual input. The driver's visual input is considered to be the angle subtended between the heading axis and a line connecting a point on the lane center at a preview distance with his eyes. An optimization procedure is used to evaluate the model parameters, and it is found that the driver's action can be best represented by a pure time delay cascaded with a classical hysteresis nonlinearity. The self-excited limit cycle frequency and amplitudes of this model system are shown to agree closely with respective quantitative aspects of the experimental data confirming the validity of the model.