K&L Soaring Support for all Schweizer sailplanes including 1-19’s, 1-23’s, etc.
Alexander Schleicher. Under “Galerie” is a listing of Schleicher gliders up to 1945 and since 1951.
Schempp-Hirth. The “Geschichte” (History) section includes details and photos of the company and its gliders.
Air&Space Smithsonian Magazine Vintage Charmers http://www.airspacemag.com/history-of-flight/vintage-charmers-7536424/