Watch history unfold in these chapter books! In Tree in the Trail, a cottonwood overlooks the way West. In Minn of the Mississippi, a turtle follows the river to the gulf. In Paddle to the Sea, a canoe journeys to the Atlantic. And a carved Seabird connects four generations of ocean travel. Approx. 75 pages each, four softcovers from Houghton Mifflin Harcourt.