My random translations of the photo captions, clockwise from top left are:

• Tour de France
• Randonneur
• Special Louison Bobet
• Tour de France de-tension

• Publisher: New Cycling
• Document: New Cycling May 1981 - '81 Derailleur Collection
• Date: May 1981
• Derailleur brands: Huret
• Derailleurs: Huret Special Louison Bobet, Huret Tour de France de-tension, Huret Tour de France, Huret Randonneur