Blurb Forums

Advice on printing architectural line drawings

I’m designing a book of my architectural work which contains a big number of plans, sections and other CAD drawings, and am wondering what is the best way of bringing these drawings into booksmart? 

I printed a book recently in which I exported PDF vector drawings into 300dpi png in Adobe Illustrator, but these came out choppy and with a blurry  yellowish tint .

Is there a better way of doing this? has anyone had any experience with printing these types of drawings?

Thanks,

Omer