The files 'subtlex-it.RData' and 'subtlex-it.csv' are the SUBTLEX-IT database itself, either as an R image that contains the database as an object or as a comma separated text file.
The file 'CrepaldiEtAl_Escop2015.pdf' is the abstract that the authors presented at the conference of the European Society for Cognitive Psychology (ESCoP) in Paphos (Cyprus) in 2015.