@misc{indiciaeb4a75a8bc138,
  title = {Copyright Record Book Class R Vol 50 PART 1; Renewal Numbers 49000-49499; 1949},
  year = {1949},
  url = {https://www.loc.gov/item/coprecbooks-00497912738/},
  note = {Source identifier: coprecbooks-00497912738}
}