World Class Tennis Technique
by Paul Roetert,Jack L. Groppel
ISBN 13: 9780736037471
Format: Paperback (288 pages) Publisher: Human Kinetics Publishers Published: Aug 2001
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The Corporate Athlete: How to Achieve Maximal Performance in Business and Life
by Jack L. Groppel,Jim Loehr
ISBN 13: 9780471353690
Format: Hardcover (304 pages) Publisher: Wiley Published: 14 Dec 1999