Consult the Card Catalogue Under Headings: Any changes to the text to correct typographical errors are listed at the end of the book. Minor changes to formatting have been made without comment. Several symbols appear in the left margin of certain catalogue entries: the equals sign (=), en-dash (–) and a circular "bullet" (●). No explanation is given in the book for the significance of these symbols which are reproduced as in the original. CATALOGUE |