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