NEW YORK (UPI) — Major league baseball attendance has reached an all-time high this season, it was announced yes terday by commissioner Bowie Kuhn. Last weekend's crowds brought the overall paid admis sions in the 24 big league parks this year to 29,287,505, breaking the previous record of 29,193,417 set in 1972. A record 16 of the 24 clubs have already drawn over a million fans and another team Oakland — needs only 55,000 fans in six remaining home dates to reach that figure. The Los Angeles Dodgers, who have finished their home season, topped all clubs with 2,100,000. Marin Academy Wins Marin Academy's cross-coun try team (40) defeated the San Rafael High School junior var sity (2-1) yesterday, 20-37, in a dual meet on Marin Academy's three-mile course, with the win ners’ Ross Parmenter (17:14), Drew D’Annel (17:16) and Hen ry Lennihan (17:17) taking the first three places