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