There are 2 titles associated with this firm.

@book{ wphp_798
  author={Hemans,Felicia},
  year={1834},
  title={Scenes and Hymns of Life. With Other Religious Poems. By Felicia Hemans.},
  publisher={William Blackwood [Princes Street] \& Thomas Cadell Jun. \& },
  address={Edinburgh},    }
@book{ wphp_457
  author={Johnstone,Christian Isobel},
  year={1836},
  title={True Tales of the Irish Peasantry as Related by Themselves; Selected by Mrs. Johnstone from the Report of the Poor-Law Commissioners},
  publisher={William Tait \& Simpkin, Marshall and Co. \& James Ridgeway \& John Cumming},
  address={Edinburgh},    }