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