The covers on these are pretty rough--detached in the case of two of them--but I've got a weakness for these old drawing instruction books, especially the more minimal ones as these are (focused on simple shapes, designs and patterns) and there are a couple curious drawings in here all their own (faces, skeletons.) I have not done a comprehensive job photographing, but photos here give a good sense--a few favorites pages first, then a sampling of a few pages from each.  Set of three as pictured. 

Whites, 1887, 9 3/16" x 6 3/16", 20 numbered pages, all completed, front and back covers detached.  Heath, 1895, 9 5/8" x 7 1/2", front cover detached, back cover missing, 8 leafs, 6 pages with graphite drawings. Prang, 8 5/8" x 5 3/4", 20 pages numbered, covers attached, 1st 8 pages with graphite drawings.