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