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