Burton, C. J. (1969). Variation studies of some phacopid trilobites of Eruasia and North West Africa.
Cita Chicago Style (17a ed.)Burton, Christopher J. Variation Studies of Some Phacopid Trilobites of Eruasia and North West Africa. 1969.
Cita MLA (8a ed.)Burton, Christopher J. Variation Studies of Some Phacopid Trilobites of Eruasia and North West Africa. 1969.
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