Glock posted video om history of Glock.
The video seems to be a slightly editted version of a longer one. There are some details that are disputable, but it is made by the company so take some grain of salt.
Also, Buffalo Bill Center of the West Museum in Cody, Wyoming started an exhibition, that will run until the end of year.
Link: https://centerofthewest.org/2016/04/08/special-exhibition-glock-makes-history/
From: Glock, Guns.com