Bibliophiles and historians may be interested in Annotated Books Online (ABO), "a virtual research environment for scholars and students interested in historical reading practices." Visitors to this project will find a database of more than one hundred scanned early modern texts dating from the late 1400s to the late 1600s, which may be searched by keyword, title, author, language, and a variety of other fields. A collapsible advanced search menu allows readers to sort their results in multiple ways as well. Those new to ABO may want to check out the project's video tutorial for demonstrations of how to search the database and how to add your own annotations, such as translations and transcriptions. ABO is an international collaboration coordinated by Arnoud Visser, Professor of Textual Culture in the Renaissance at Utrecht University in the Netherlands, and at this time of writing the project includes contributions from fifteen libraries around the world.