From the Terrier website:
TERRIER (Temporally Extended, Regular, Reproducible International Event Records) BETA is a new machine coded event dataset produced from a historical corpus ranging from 1979 to 2016, available for download at OSF. Event data generates structured records of political events described in text in the form of (1) a source actor (2) committing an action (3) against a target. The political events recorded in the dataset include a wide range of political behaviors: meetings, statements, provision of aid, protests, attacks, and violence. This dataset is an initial beta release of the data, lacking event geolocation. We encourage researchers to carefully check the data they use and to contact our team with any issues they uncover regarding the data by opening a thread on our discussion forum.
The dataset was produced by a team at the University of Oklahoma as part of the NSF RIDIR grant “Modernizing Political Event Data” SBE-SMA-1539302. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of NSF or the U.S. government.