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