The authors would like to express their very great appreciation and deep debt to the authors of the first edition of this volume: Marvin G. Fifield, Philip W. Davidson, Howard Garner and Jack Stark.
Much of the content of the first edition remains useful. Permission was granted to use liberal portions of that 1989 edition in this current version. For that permission, the authors of the second edition are most grateful.The authors would also like to acknowledge Bruce Eddy for editing this document.
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