These are some books written by members of the meetup.
Max Kuhn & Kjell Johnson
JD Long
Drew Conway & John Myles White
Tony Fischetti
Q. Ethan McCallum
Richard Cotton
Andrew Gelman & Jeronimo Cortina
Andrew Gelman
Andrew Gelman & Deborah Nolan
Paul Dix
Jeroen Janssens
Bryan Lewis and Michael Kane
Hadley Wickham
Julia Silge & David Robinson
Hadley Wichkam
Andrew Gelman & Jennifer Hill
Cathy O'Neil & Rachel Schutt
Rob Hyndman
David Robinson
Jared P. Lander
Max Kuhn
Chris Fregly & Antje Barth
Daniel Y. Chen
Andrew Gelman, John B. Carlin, Hal S. Stern, David B. Dunson, Aki Vehtari & Donald B. Rubin
Mike Dewar
Harlan Harris, Sean Patrick Murphy & Marck Vaisman
JJ Allaire
John Myles White
Wes McKinney