Image: PSM V74 D233 Thorium radioactive incandescent gas mantle placed above plant seeds
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Description: Thorium radioactive incandescent gas mantle placed above plant seeds
Title: PSM V74 D233 Thorium radioactive incandescent gas mantle placed above plant seeds
Credit: Popular Science Monthly Volume 74 (January to June 1909), Page 229, Fig. 8.
Author: Unknown
Usage Terms: Public domain
License: Public domain
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