About ten years ago I bought a fantastic paperback book and I thought it would be a good idea to mention it here. It has 391 pages and is crammed with thousands of print quality drawings, animal, banknote engraving, leaves, heraldic, in short you name it and it's in there ! Look at Amazon.com under the title : Graphic Ornaments 1900 (Pepin Press Design Books) (Paperback)
by Pepin Van Roojen (Author) There still a few left for around $17,- , peanuts for the treasure you are getting !
As you almost never can see the pages of the book you are buying on the internet I have included a few scanned pages so that you have an idea.
Good luck !