Use a distinctive pen color, mark the location of the twenty-eight-inch fall line. What is the significance of this line?
Use the maps on pages 467, 470, and 476 in your text as a guide. Use the outline map of the American West that follows:
Refer to Map Exercise 17-1.

Question

Use a distinctive pen color, mark the location of the twenty-eight-inch fall line. What is the significance of this line?
Use the maps on pages 467, 470, and 476 in your text as a guide. Use the outline map of the American West that follows:
  Refer to Map Exercise 17-1.

Use a Distinctive Pen Color, Mark the Location of the Twenty-Eight-Inch