அதிகம் பார்க்கப்பட்டது இருந்து United States Bureau of Mines

Reel 1, an oil field is located, drilled, brought in, and pumped. Shows the Garber Field in Oklahoma. Reel 2 shows how pipe is laid and cleaned. One...

Tells the story of the mining and manufacture of copper from the crude ore to the finished product.

The educational film, The Magic of Sulphur, is a color film describing how sulfur is found and some of its uses.