Base toundra is a simple book with lists, and formatting defined with structural markup. This book contains accessibility features such as a table of contents, landmarks, reading order, structural navigation, index, semantic structure, in-text links, and backlinks. Page numbers are included and reflect the print product. All in-text citations are linked, however backlinks only return to their first in-text citation. Linked DOIs are provided, but are not uniquely identified. Some images and tables may appear on pages different from the print version. No images have short descriptions.