Secret World Project

Fundacja Wspierania Kultury DIFA

Secret World Project                            

Wanderer Books

Top Secret Projects of World War II              

Global Communications/Conspiracy Journal

Secret Black Projects of the New World Order (English Edition)

Air World

Hawker's Secret Projects: Cold War Aircraft That Never Flew (English Edition)

Outskirts

Funding projects in the third world: Hidden secrets revealed (English Edition)

Ian Allan Publishing

Japanese Secret Projects (English Edition)      

ARADO'S SECRET PROJECTS (English Edition)        

Secret Projects: Ramjet Spitfire (English Edition)

Bathtub Row Press

The Secret Project Notebook (English Edition)    

Greenhill Books

Secret Projects of the Kriegsmarine: Unseen Designs of Nazi Germany's Navy (English Edition)