Environmental Tests instructional booklet
- 1971

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Small JPG1200 x 1468px — 326 KBFull-sized JPG2350 x 2875px — 1.4 MBOriginal fileTIFF — 2350 x 2875px — 19.4 MBManual containing instructions for ten experiments to determine pollution levels of the air and water. The front cover depicts a boy examining a petri dish with a small magnifying glass. Manual corresponds to the Johnny Horizon Environmental Test Kit.
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“Environmental Tests Instructional Booklet.” Salem, Massachusetts, 1971. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1pr7y0j.
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