| USA 1969 (21 Jun) Space Cover INTERPLANETARY MONITORING PLATFORM Vandenberg AFB
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| USA 1969 (21 Jun) Space Cover IMAGE ORBITING PLATFORM" and "INTERPLANETARY MONITORING/PLATFORM (IMP-G) DESIGNATED/EXPLORER 41 CARRIES 12 INDI-/VIDUAL EXPERIMENTS DESIGNED/TO STUDY SOLAR PLASMA MAG-/NETIC FIELDS AND COSMIC RAYS." addressed to Sherry Hills N.J. and affixed with 5c Franklin Roosevelt stamp cancelled "VANDENBERG AFB CA/ JUN 21/AM/1969/93437."
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Item #: INV-128503
Condition Co
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