The book is called The Elements of Pop-up by David A. Carter and James Diaz.
It is FULL of detailed explanations and samples of how to make any and every pop-up element a child (or her Dad) could imagine. I think it's pretty funny that every time I'm out of the way I'm likely to find some bits and pieces later on that they've worked on together.
The nature scene above is one of hers, and the turkey below is his. I just love the details and thought she puts into her work -- him, too, but this blog is about kids' crafts :-) I can so easily imagine the story that went through her mind as she created this idyllic scene. I wonder if her bunny had a name, or if he visited the playful fishies often?