. . . . . . "Science radio programs"@en . "Program 146: The story of helium, which for so long was thought to be useless because it would not burn, and has only recently been appreciated for its lift capacity. Program 147: The story of three hunters in Upper Michigan who accidentally discovered huge iron deposits."@en . . . . "Radio serials"@en . "Drama"@en . . "Gas that won't burn"@en . . . . . . "Adventures in research. 146, The gas that won't burn Adventures in research. 147, New steel horizons"@en . "Historical radio programs"@en . . . "Radio docudramas"@en . "History"@en . "Educational radio programs"@en .