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