Diane Crookham-Johnson, a member of the family that established Musco Lighting of Oskaloosa, will discuss the company’s involvement with search and rescue efforts at the site of the September 11, 2001, terrorist attacks on the World Trade Center and the Pentagon. Her presentation at 7 p.m., Thursday, March 29, 2007, at the Carnegie Library Museum , 1123 Willis Avenue , Perry, is free and open to the public.  Crookham-Johnson will focus on why an international company, such as Musco, which illuminates everything from the world’s greatest sports venues to disaster sites, chooses to base itself  in a small Iowa town. She will give examples of why small towns work, and how small rural communities can volunteer and provide crucial assistance even to the world’s great population centers during disasters such as 9-11.