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Special agent! Where are you running to?

Special agent! Where are you running to? (ca. 1951)

Be sure not to lower your guard and become careless, increase your political vigilance!

Be sure not to lower your guard and become careless, increase your political vigilance! (1955, August)

The crystal receiver made by brother makes a sound

The crystal receiver made by brother makes a sound (1957, August)

We love science

We love science (1994, May)

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