Lists open Access reprints from Michigan Publishing available online (at HathiTrust) or for purchase from Amazon.
Textbooks for Arabic courses (all levels, some specific to regional varieties) account for the bulk of the list. The remaining books are a mix from fields including psychology, political science, health sciences, and business management.
"The SPO Scholarly Monograph Series is an interdisciplinary collection of original, open-access scholarly monographs and essays published by the Scholarly Publishing Office of the University of Michigan Library."