There are 2 titles associated with this firm.

@book{ wphp_11008
  author={Hemans,Felicia},
  year={1835},
  title={Songs of the Affections, with Other Poems. By Felicia Hemans. Second edition.},
  publisher={William Blackwood [Princes Street] \& Thomas Cadell Jun. \& },
  address={Edinburgh},    }
@book{ wphp_509
  author={Moir,David and Hemans,Felicia},
  year={1836},
  title={Poetical Remains of the Late Mrs. Hemans},
  publisher={William Blackwood and Sons \& Thomas Cadell [London] \& },
  address={London},    }