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