This  Timeline (click the word Timeline) covers PITA’s history from 1931-2011.  It is a large file so may take a few minutes to open.  When printed this timeline is over 25′ long so it is recommended you do not try and print it.  You may download it to view or use zoom to view online.
To find the zoom button move your mouse to the lower right of your screen – you should see something like this. 
  The + button zooms.Zoom can also be found by clicking the three dots in the upper right corner.