The website Textbook History is a good resource for old biology books. Ronald Ladouceur provides:
A database of 82 American high school biology textbooks, from Elements of Biology (1907) through Modern Biology (1969).
Each entry includes a brief observational note and a 0-5 ranking based on a qualitative assessment of the presentation of the topic of evolution. The table also includes title, copyright date, author(s) and category: P for phylogenetic, E for economic, U for unity of life, and N for normative. I will be writing more on this categorization scheme shortly.