D. A. T. HarperBooksMicrocomputers in palaeontologyBrachiopods from the upper Ardmillan succession (Ordovician) of the Girvan Distict, ScotlandGlobal Synthesis of the Ordovician SystemEarly palaeozoic biogeography and palaeogeographyNumerical palaeobiologyA revised correlation of Ordovician rocks in the British IslesAuthor data: Open Library