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