Journal Article GEOGRAPHIC VARIATION, SPECIATION, AND CLINES Get access Philip W. Hedrick Philip W. Hedrick Division of Biological Sciences University of Kansas Lawrence Kansas 66045 Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 32, Issue 3, 1 September 1978, Pages 687–689, https://doi.org/10.1111/j.1558-5646.1978.tb04617.x Published: 01 September 1978 Article history Received: 29 December 1977 Published: 01 September 1978
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