What is Arabic Collections Online? Arabic Collections Online (ACO) is a publicly available digital library of public domain Arabic language content. ACO currently provides digital access to 6303 volumes across 4132 subjects drawn from rich Arabic collections of distinguished research libraries. Supported by New York University in Abu Dhabi, this mass digitization project aims to feature up to 25,000 volumes from the library collections of NYU and partner institutions. These institutions are contributing published books in all fields—literature, business, science, and more—from their Arabic language collections.