There are 3 titles associated with this person.

@book{ wphp_6921
  author={Sage,Letitia Ann},
  year={1785},
  title={A letter addressed to a female friend. By Mrs. Sage, the first English female aerial traveller; describing the General Appearance and Effects of her expedition with Mr. Lunardi's balloon; Which ascended from St. George's Fields on Wednesday, 29th June, 1785, accompanied by George Biggin, Esq. The second edition.},
  publisher={},
  address={London},    }
@book{ wphp_7063
  author={Sage,Letitia Ann},
  year={1785},
  title={A letter addressed to a female friend. By Mrs. Sage, the first English female aerial traveller; describing The General Appearance and Effects of her expedition with Mr. Lunardi's balloon; Which ascended from St. George's Fields on Wednesday, 29th June, 1785, accompanied by George Biggin, Esq. The third edition.},
  publisher={},
  address={London},    }
@book{ wphp_6805
  author={Sage,Letitia Ann},
  year={1785},
  title={A letter, addressed to a female friend. By Mrs. Sage, the first English female aerial traveller; describing the general appearance and effects of her expedition with Mr. Lunardi's balloon; Which ascended from St. George's Fields on Wednesday, 29th June, 1785, accompanied by George Biggin, Esq.},
  publisher={},
  address={London},    }