Chicago [?]: Self-published by the author, 1968. 72p., illustrated with several author-sketched diagrams amidst the key-board-set text, text is reproduced on legal-sized (14x8.5 inch) leaves, printed and folded as a single signature of doubled pages with center staples. A neat amateur binding; all leaves bent at the upper corner-tips, otherwise unmarred. Clean and sound, a very good copy.