File:Plate II The Locust Plague In The United States (1877).jpg
Country overrun in 1874.
Country invaded in 1874, but which suffered less on account of being sparsely settled.
Country ravaged in 1874, and which suffered most.
Riley, Charles V. (Charles Valentine), 1843-1895. The Locust Plague In the United States: Being More Particularly a Treatise On the Rocky Mountain Locust Or So-called Grasshopper, As it Occurs East of the Rocky Mountains, With Practical Recommendations for Its Destruction. Chicago: Rand, McNally & Co., 1877.Riley, Charles V. (Charles Valentine), 1843-1895. The Locust Plague In the United States: Being More Particularly a Treatise On the Rocky Mountain Locust Or So-called Grasshopper, As it Occurs East of the Rocky Mountains, With Practical Recommendations for Its Destruction. Chicago: Rand, McNally & Co., 1877.
https://catalog.hathitrust.org/Record/001506898