Many years ago my dad was a construction supervisor for Michael Baker
Engineering Company.(www.dogpile.com Michael Baker Engineering Company
Flowood Mississippi if y'all want to look it up) The company used to be
home based here in Jackson but years ago they moved across the Pearl
River east of Jackson in the little city of Flowood.I am familiar with
blueprint paper although I have never used it before.A lot of people
travel with their laptop computers and if there was some sort of copy
papers available they could use to hold against't the screens of their
laptop computers if they want to copy something on the go,that would
save them a lot of time.Some people still use blueprint because it is
inexpensive,according to a search I did at www.howstuffworks.com
Blueprint Paper

I still think my idea is a good idea.
cuhulin