Nice idea from Rob to create a book with linkage models. What about to plan making a serie with mechanisms by subject with working models, I mean, Ratchet, Linkage, Gears, cams, pulley,etc.? It would be nice and comfortable.
In addition to Rob's Mechanism citation on the website: http://www.flying-pig.co.uk/mechanisms/
There are several other sites that are fine examples of mechanisns, most specifically for paper automata:
Just gotta look through page links.