Here are entered works on the part of the United States south of the Mason-Dixon Line, the Ohio River, and the southern border of Missouri and Kansas, extending from the Atlantic Ocean to the western border of Texas, sometimes including or excluding individual states along these borders.
Here are entered works on the southern part of the United States west of the Mississippi River, including the states of Louisiana, Arkansas, Missouri, Texas, Oklahoma, Kansas, New Mexico, Colorado, Arizona, Utah, Nevada and California.
