There are 1 titles associated with this firm.

@book{ wphp_1441
  author={Unknown,},
  year={1836},
  title={The Son of Duplicity; or, the still small voice.},
  publisher={James Ridgway and Sons [169 Piccadilly] [1826, 1834–1841] \& Simpkin, Marshall and Co.},
  address={London},    }