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