Turner, Judith (September 1979). "The environment of northeast England during Roman times as shown by pollen analysis". Journal of Archaeological Science. 6 (3): 285–290. Bibcode:1979JArSc...6..285T. doi:10.1016/0305-4403(79)90006-2.
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Turner, Judith (September 1979). "The environment of northeast England during Roman times as shown by pollen analysis". Journal of Archaeological Science. 6 (3): 285–290. Bibcode:1979JArSc...6..285T. doi:10.1016/0305-4403(79)90006-2.