The authors, leading researchers in the field, lay out the details with pictures of fossils, whale embryos, and even a four-limbed dolphin. Evolution: Education and Outreach is aimed in part at K-12 teachers, so this piece is not too technical. You're not going to find a better short intro to whale evolution.
Fig, 27, "From Land to Water: the Origin of Whales, Dolphins, and Porpoises" Thewissen, Cooper, George, and Bajpai."
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