Journal Article A de facto standardized curriculum for US college biology and zoology Get access Frank Heppner, Frank Heppner Search for other works by this author on: Oxford Academic Google Scholar Carl Hammen, Carl Hammen Search for other works by this author on: Oxford Academic Google Scholar G. Kass-Simon, G. Kass-Simon Search for other works by this author on: Oxford Academic Google Scholar William Krueger William Krueger Search for other works by this author on: Oxford Academic Google Scholar BioScience, Volume 40, Issue 2, February 1990, Pages 130–134, https://doi.org/10.2307/1311346 Published: 01 February 1990
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Heppner et al. (1990) studied this question.