Mound City Memories features twenty-seven essays and interviews about baseball in St. Louis, focusing on the St. Louis Cardinals and the St. Louis Browns, as well as on Major League players raised in St. Louis.   Rick Salamon profiles writer Bob Broeg, Joe Scott asks if Dizzy Dean's thirty-win season is legitimate, Jim Rygelski recalls Mark McGwire's seventy-home-run season, while Fred Heger compares Hall of Famers Rogers Hornsby and George Sisler. Peter Morris writes on little-known nineteenth-century baseball figure Asa Smith, while John Stahl provides an extensive profile of journeyman pitcher Barney Schultz.