I noticed that someone on the New Zealand EC12 discussion group is interested in obtaining a copy of the excel programs that accompanied the book Optimizing. Way back when you could buy the floppy from Bob Wells.
The size of the programs are 659KB, 222KB, 269KB, 133KB and 24KB, so none of them are very big.
He might go to this web page and try sending an email to Bob. I do not know if the email address is still good. Or try sending him a letter.