Many of you have probably seen the BAC Aircraft History page. There is some good information about the Aero Center aircraft line. It also contains historical information on the Beechcraft Skipper and Beechcraft Duchess.
You can order the book Beechcraft Pursuit of Perfection from a variety of sources and conditions at Amazon.com starting around $18 (when I last looked). Get ’em while they are hot, there only appear to be a few left.