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May 20, 1918

Two hundred workers are missing in an industrial plant explosion at the Aetna Chemical plant in Oakdale, PA. Worker cabins near the plant were destroyed by TNT. Twenty-five bodies were found in one small area of the plant. 

Source: "Two Hundred Employees Missing," The Daily Gate and Constitution-Democrat, Keokuk, Iowa, May 20, 1918. Page 1, Column 5.

Earlier Event: May 19
May 19, 1918
Later Event: May 21
May 21, 1918