at finding the air AS fresh as it is on the surface. A comparatively new innovation—one that means a great deal to the miners—is the First Aid to the Injtred Corps. These have been established in a large number of anthracite mines. They are formed of volunteers among the young men of the mines., scientific american, 1908-02-15

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at finding the air AS fresh as it is on the surface. A comparatively new innovation—one that means a great deal to the miners—is the First Aid to the Injtred Corps. These have been established in a large number of anthracite mines. They are formed of volunteers among the young men of the mines., scientific american, 1908-02-15

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