Hirst, Stanley, 1923, On some arachnid remains from the Old Red Sandstone (Rhynie Chert Bed, Aberdeenshire)

Hirst, Stanley, 1923, On some arachnid remains from the Old Red Sandstone (Rhynie Chert Bed, Aberdeenshire), Annals and Magazine of Natural History, Including Zoology, Botany and Geology, Being a Continuation of the ' Magazine of Botany and Zoology', and of Louden and Charlesworth's ' Magazine of Natural History', Series 9 12, pp. 455-474