Figure 1.  Illustration renewal and recycling in The Dinosauria (second edition).  The graph shows the number of recycled illustrations as a percent of all illustrations, according to chapter.  Chapters are numbered as in the book, except for the two introductory chapters: Saurischia (S) and Ornithischia (O) (see Table 1).  Systematic chapters are in green, non-systematic chapters are in purple; chapter 25 (taphonomy) has no illustrations and is excluded.