Related Clues:

• Event outlawed by intl. treaty
• Treaty topic
• "This is __"
• Underground experiment, for short
• Controversial 50's event
• ''This is only ___''
• "This is only __"
• ''This is only ___!''
• Bikini trial
• ''This is only __''
• Bomb trial, in old headlines
• Producer of a large mushroom
• Source of some mushrooms
• Event drawing intl. criticism
• SALT concern