Photograph of two oil miners working a city lot oil well, in Blackwell, OK, with a note that reads, "Oklahoma has another oil boom, this time a series of backyard oil wells drilled on city lots on the edge of the residential section of Blackwell. Two of the oil 'miners' are shown working their well, which is the smallest in the world. The wells come in at an average depth of only twenty-three feet from an oil sand eighteen inches deep. The wells are being drilled with post augers and pumped by hand with common farm pitcher pumps. The wells produce five to six barrels per day."