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