@misc{indiciae3c4986051464,
  title = {Copyright Record Book Class R Vol 57 PART 2; Renewal Numbers 56500-56999; 1949-1950},
  year = {1949},
  url = {https://www.loc.gov/item/coprecbooks-00497912878/},
  note = {Source identifier: coprecbooks-00497912878}
}