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