Free quick-find warbler identification pages are available from Princeton University Press. There are seven pieces in the set, all downloadable as pdf or jpg files. Each opens as a full-color image 10 by 7 inches. The guides are taken from the book “The Warbler Guide,” a Princeton publication by Tom Stephenson and Scott White. There guides are: warbler faces, birds at a 45-degree view, eastern warblers spring, eastern warblers fall, undertail view, complete under view, and western spring warblers. I downloaded faces and 45-degree-look as pdf files. ID is possible from the images. I think these would be very useful for photographers in particular, when a photo image poses ID questions. Compare your photo with the illustration on your pdf file, both there on your computer screen. If you have the book (and a fine ID guide it is), you have these quick-find pages. Having them on the computer, side by side with your photos, should make the ID effort easier. Go to blog.press.princeton.edu, choose the page for birds and natural history, choose free download quick finders, and download (very fast). Here is the faces guide. This is a reduction from the actual 10x7 size.