These materials are web applications that existed on flash drives (archived in Box 9), one for each conference, and individually transferred. While most of the digital materials appear to be intact, some of the data, particularly from the 2015 Big Data Conference and 2019 KDD Conference folders, was corrupted or unreadable and required data recovery operations. Therefore, some conference folders may include missing files, corrupted data, or broken hypertext links. Please see the control folder (data recovery) for more information or “Recovered data” within the conference folder for missing data.