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