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  1. By: Gray, Maria Emma, - Gray, John Edward,
    Edition: [Third edition]
    Publication info: London :M.E. Gray,1874.
    Holding Institution: Natural History Museum Library, London
  2. By: Gray, Maria Emma, - Gray, John Edward,
    Publication info: London,Longman, Brown, Green and Longmans,1859.
    Holding Institution: Smithsonian Libraries
    BHL Collections: Early Women in Science