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