Matters Arising | Published:

Circular structures of large scale and great age on the Earth's surface

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  1. 1

    Saul, J. M. Nature 271, 345–349 (1978).

  2. 2

    Kellaway, G. A. Proc. geol. Soc. Lond. 1617, 100–101 (1964).

  3. 3

    Durrance, E. M. Proc. geol. Soc. Lond. 1617, 102–103 (1964).

  4. 4

    Durrance, E. M. Trans. Devon. Ass. 100, 309–311 (1967).

  5. 5

    Ten Mile (1:625,000) Map of Great Britain (Institute of Geological Sciences, London).

  6. 6

    Lowman, P. D. National Geographic 130, 645–670 (1966).

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