The British Library has uploaded a million illustrations to Flickr, and would like you to help catalog them. They are all in the public domain and are pulled from their digitization efforts. Each illustration is carefully mechanically curated with the name and page number of the source book, but it's their hope that you dear reader will do some cataloging work for them.
Image from "Boating in Bavaria, Austria, and Bohemia, down the Danube, Moldau and Elbe. By Rev. A. F. R. Bird ... and the rest of the boat's crew. [With illustrations.]" p. 170.