Blueprints

Hello,

I think it would be helpful to discuss potential sources for blueprint research. I have found some sources through the following sites or places.

The Smithsonian institute for research (They will have physical copies available upon request for a reasonable fee)

Scribd.com ( a good cache of misc. documents and other technical manuals)

Various museums have physical prints depending on the item in question.

Post below what sources you have found!