I am a fan of old scientific diagrams- some a amazing art! I wanted to pass along some I have found. These are copyright free, so you can print them out if you wish. Please add your own. https://archive.org/stream/atlasepitomeoftr00helf#page/88/mode/2up https://archive.org/stream/atlasepitomeoftr00helf#page/96/mode/2up http://biodiversitylibrary.org/page/12865745#page/247/mode/1up http://www.biodiversitylibrary.org/item/61648#page/46/mode/1up http://biodiversitylibrary.org/page/12865745#page/249/mode/1up http://www.biodiversitylibrary.org/item/113945#page/153/mode/1up Ok, there is an old, incredibly racist book, "Crania America" that is full of amazingly well done skull diagrams, way too many for me to post. Here is where you see the whole book: http://www.biodiversitylibrary.org/item/109267#page/11/mode/1up And here are some images from it: I've got hundreds more diagrams on my pinterst page, send me a PM if you want my pinterest info.