@article{DA,
      author = {Unknown},
      url = {http://library.usi.edu/record/1529675},
      title = {Heavy smoke from boilers and the team of horses or mules},
      publisher = {University of Southern Indiana},
      abstract = {The donor's father was in the oil business beginning in  the 1920s in Oklahoma and Texas. He was in the  transportation end of the business. According to an  interview with the donor, big, heavy boilers provided the  steam for the drilling rig. These were so heavy that they  required a team of mules to move them. It is believed that  these photographs reflect this activity.},
      number = {DA},
      recid = {1529675},
      address = {1920},
      year = {1920},
}