Orison Swett Marden：Pushing to the Front, Excerpt 363

According to a long series of investigations by Drs. Benoysten and Lombard into occupations or trades where workers must inhale dust, it appears that mineral dust is the most detrimental to health, animal dust ranking next, and vegetable dust third.

Source： https://www.gutenberg.org/ebooks/21291
Locator：Excerpt 363 · Verified：2026-10-19 · Verification：Short excerpt

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