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The Law of Gravity HC Weekly Reader Books by Johanna Hurwitz 1978 US $28.00

Vintage 1957 Danny Dunn & the Anti-Gravity Paint Weekly Reader Book Club US $4.00

DANNY DUNN AND THE ANTI-GRAVITY PAINT, 1956 WEEKLY READER BOOK, GREAT SHAPEW; US $9.00

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DANNY DUNN AND THE ANTI-GRAVITY PAINT, 1956 WEEKLY READER BOOK, GREAT SHAPEW;, Vintage 1957 Danny Dunn & the Anti-Gravity Paint Weekly Reader Book Club, The Law of Gravity HC Weekly Reader Books by Johanna Hurwitz 1978,

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