4 books
A Preliminary List of Fossil Mastodon and Mammoth Remains in Illinois and Iowa (Classic Reprint)
A Preliminary List of Fossil Mastodon and Mammoth Remains in Illinois and Iowa - Scholar's Choice Edition
A Preliminary List of Fossil Mastodon and Mammoth Remains in Illinois and Iowa (Volume 5)
A Preliminary List of Fossil Mastodon and Mammoth Remains in Illinois and Iowa