
June 1942. "TVA chemical plant where elemental phosphorus is made. Vicinity of Muscle Shoals, Alabama." View full size. 4x5 Kodachrome transparency by Alfred Palmer for the Office of War Information.
Phosphorus for incendiary bombs, shells, and for smoke grenades and the like. Possibly for agricultural phosphorus as well since the plant pre-dated the war - operations started in 1934.
Wonder if the plant is still there.