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The bibliography contains around six hundred and fifty bibliographic references, and their abstracts (when available). Associated references are grouped into ten subject categories to facilitate browsing. Within each subject category the references are in order by personal or corporate author and publication date (or by title if no author was known). References pertinent to several subject categories are entered in each relevant category. Electronic data processing has facilitated the permuted title index or KWIC (Key-Word-In-Context) index. In the KWIC index, references are entered in alphabetic order by key words from titles. Appearing to the right of each entry in the KWIC index is a reference code to permit the reader to locate the corresponding entry in the bibliography. The reference code indicates the order of the references in the bibliography by numerical sequence of subject category, then by alphabetical sequence of author or title, and finally by publication date or sequence code. (Author)