Although it would be impossible in this limited space to recognize everyone who has aided me in the completion of this project, I feel compelled to mention several of the most important. First of all, my wife, Drlynn, helped motivate me to ﬁnish the work and always showed the understanding essential for someone living with an individual compiling a work of this size. Secondly, both my son John, who was born while I was in the process of putting words to paper, and my son Alex have provided me with the inspiration I needed to put the ﬁnishing touches on this book. Also, without question my mother, Jo Ann; my grandmother, Marie; and my father, Donny, have all aided me ﬁnancially and emotionally during my quest to reach my ultimate goal, this book. To them, I extend my ultimate thanks. Furthermore, I must acknowledge the members of my committee, Kenneth Winkle, Parks Coble, Kenneth Price, and especially Benjamin Rader. Dr. Rader has allowed me to pursue my intellectual curiosities under his direction and provided superior instruction and advice throughout my years at the University of Nebraska —Lincoln.