| USA 1967 (23 May) Space Cover NCAR BALLOON BASE Palestine Texas
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| USA 1967 (23 May) Space Cover "BALLOON LAUNCHED/FROM/IMAGE BALLOON/NCAR BALLOON BASE/ PALESTINE TEXAS" and typed manu"GAMMA RAY DETECTION FOR/DR. E.L. CHUPP OF THE/ UNIV. OF NEW HAMPSHIRE" unaddressed and affixed with 5c National Park Service cancelled "PALESTINE, TX/MAY 23/PM/1967/75801"
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Item #: INV-128424
Condition Co
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