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