VerbNet 2.3 - unknown date

https://bitbucket.org/gchrupala/delta-h/src/4edcbd7e810f/ext_sem_features/verbnet-2.3/?at=default
VerbNet 3.1 - 2012-07-24

http://verbs.colorado.edu/verb-index/vn/verbnet-3.1.tar.gz
VerbNet 3.2 - 2013-04-26

http://verbs.colorado.edu/verb-index/vn/verbnet-3.2.tar.gz