@dataset{currentDoc,
  author = {},
  title = {Tillsonburg Ontario. 1:50,000. Map Sheet 040I15, ed. 6, 1986},
  publisher = {Other Borealis Collections},
  issued = {1986-01-01},
  howpublished = {{\url{https://doi.org/10.5683/SP3/PPG9U6}}}
}