JF Ptak Science Books: Welcome to October: Make Your Own Baseball Paper Computer (1961)

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JF Ptak Science Books: Inventions

Ethnopharmacologic Search For Psychoactive Drugs - 1967

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JF Ptak Science Books: 45 entries from January 2009

Use of color 5-3-12 by Pat Varley - Issuu

Physics & Maths Catalog - JF Ptak Science Books--Physics/Maths Catalog

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