Related Link... MISL 1986-87 Media Guide Click for more info. MSL 1991-92 Official Guide This was the last year of the Major Indoor Soccer League (MISL) however the League took out the “I” for Indoor and went simply as “MSL”. This was because there was hope the league would become the new “Outdoor” League in North America. Unfortunately this would prove to be the final season for the circuit—which was down to 7 teams. The book is in good condition Click on photo to see full Image Gallery.