Where can i find a copy (old or new) of blue prints for Hoover dam?

I am trying to build a digital representation of the dam, and i want to make it as accurate as possible so i have been unsuccessfully looking for blue prints that i will be able to read on my computer. So that i can make this project a accurate as possible. I did find the blueprints on the UNLV library website but they were unreadable both on screen and printed off. Thanks for any help offered.