Pictorial Encyclopedia of Historic Architectural Plans, Details and Elements
Reprint of a book originally published in 1923, so there's nothing modern in it. Well made, durable construction. Bought my copy from Barnes and Nobel back in 1998 and it's held up very well.
About 140 pages. Pen and ink line drawings on the right hand page with brief descriptions on the facing page. Lot's of stuff to draw inspiration and potential ideas from.
Probably should be able to find a decent used copy for under $5 including shipping.