This list is available as a csv at https://www.jaredlander.com/backdata/DataInRFE.csv.  All datasets available at this site are at https://www.jaredlander.com/datasets.

Jared Lander is the Chief Data Scientist of Lander Analytics a New York data science firm, Adjunct Professor at Columbia University, Organizer of the New York Open Statistical Programming meetup and the New York and Washington DC R Conferences and author of R for Everyone.