By A Mystery Man Writer
Sisterhood of Spies International Spy Museum
Technology during World War II - Wikipedia
The Scientific and Technological Advances of World War II, The National WWII Museum
The National WWII Museum New Orleans: Collections: Artifacts: SOE Suitcase Radio
WWII's Most Ingenious Spy Gadgets & Tech
Secret Agent Shenanigans: 13 Weird Spy Weapons And Gadgets – Stay Weird
Cold War espionage - Wikipedia
Hacking When It Counts: Spy Radios
Escape Kits: Real-Life British Spy Gadgets from World War II - Core77
Gadgets used by British spies in WWII: Collection of tools given to SOE agents by MI9 now for sale
Looking Past the Gadgets, and Into Spies' Minds - The New York Times