6 books
General Zoölogy
General Zoölogy; Practical, Systematic and Comparative; Being a Revision and Rearrangement of Orton's Comparative Zoölogy
General Zoology
Introduction to Elementary Practical Biology; A Laboratory Guide
General Zoölogy: Practical, Systematic and Comparative; Being a Revision and Rearrangement of Ortons Comparative Zoölogy (Classic Reprint)
Introduction to Elementary Practical Biology