Most, if not all, of the books you are using in this exhibit were stereotyped. This silent documentary from 1925 includes footage of stereotyping, including making a mold, casting a new plate, and printing multiple pages from plates. The relevant bit starts at 6:28 and goes to about 8:37.
Engravings are a form of intaglio printing; here is a video
And here is a nice instructional video about lithography
Live Boys of Texas by Arthur Morecamp
Publication Date: 1879