Charles de Gaulle airport (CDG/LFPG) in Paris had great expansion in the new century, including new runways and terminal 2 buildings.
What was the airport layout before the great expansion?
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You will hardly find anything complete on the web as :
I do have an Air France magazine with Charles de Gaulle history til 2002, and another dedicated to the Terminal 2F extension, but because those are copyrighted materials, I can't post them here. Sorry.
Though, you can head to the following sites :
http://www.entrevoisins.org/paris-charles-de-gaulle-de-1945-1975.aspx (video - if you don't mind quality of the era)
http://www.aeroportsdeparis.fr/groupe/presse/40-ans-paris-cdg/photographies (a couple pictures) http://airinfo.org/2014/03/07/paris-charles-de-gaulle-fete-ses-40-ans-video-photos/ (dedicated copy of the above)
http://www.goussainlivres.com/librairie/librairie/aeroport-roissy-charles-de-gaulle=198.html (one small cropped overview from a book - bear in mind that most relevant structures of the airport is inside that picture and everything around are empty areas)
Basically, you only had the Terminal 1, and one runway. Airport name was "Paris Nord" before becoming "Roissy-en-France", then finally called "Charles de Gaulle" just before inauguration (8 of March, 1974). And initial planned extensions were identical copies of the Terminal 1 all other the place including where T2 and T3 are today. Sorry, I can't post a plan from the Air France book, but it's rather similar to the one you can spot in the video above.
There are also rare documents you could retrieve from old magazines issued at the time (Air & Cosmos to name the one I know of) or magazines like EntreVoisins (used to collect them at Maison de l'Environnement, Athis-Mons, near Delta Museum) which sometimes raises issues about noise pollution from Paris Airport platforms (comparative maps of the airport through the years)