130 BULLETIN 1224, U. S. DEPARTMENT OF AGRICULTURE. 
Table 2. — County groups used in this study — Continued. 
District, State, and county. 
District, State, and county. 
District, State, and county. 
Group 26. 
Group 33— Continued. 
Group 37— Continued. 
California: 
Texas— Continued . 
Tennessee: 
Madera. 
Cherokee. 
Dyer. 
Merced. 
Houston. 
Lauderdale. 
Sacramento. 
Lee. 
Tipton. 
San Joaquin. 
Leon. 
Solano. 
Lamar. 
Group 38. 
Yolo. 
Marion. 
Milam. 
Kentucky: 
Group 27. 
Panola. 
Christian. 
Red River. 
Daviess. 
California: 
Robertson. 
Henderson. 
Los Angeles. 
Rusk. 
Todd. 
Orange. 
Smith. 
Group 39. 
Santa Barbara. 
Wood. 
Louisiana: 
Bourbon. 
Group 28. 
Claiborne. 
Clark. 
Union. 
Fayette. 
California: 
Jessamine. 
Imperial. 
Group 34. 
Madison. 
Arizona: 
Texas: 
Mercer. 
Maricopa. 
Brazoria. 
Scott. 
Chambers. 
Woodford. 
Group 29. 
Galveston. 
Harris. 
Group 40. 
Oklahoma: 
Jefferson. 
Blaine. 
Wharton. 
Tennessee: 
Caddo. 
Bedford. 
Canadian. 
Group 35. 
Ratherford. 
Comanche. 
Cannon. 
Dewey. 
Garfield. 
Grady. 
Kay. 
Louisiana: 
Arcadia. 
Assumption. 
Coffee. 
Group 41. 
Iberia. 
Alabama: 
Kingfisher. 
Kiowa. 
Logan. 
McClain. 
Major. 
Oklahoma. 
Lafayette. 
Cullman. 
Rapides. 
Fayette. 
St. Landry. 
Limestone. 
Madison. 
Group 36. 
Marion. 
Walker. 
Osage. 
Payne. 
Cleveland. 
Garvin. 
Hughes. 
Lincoln. 
Okfuskee. 
Arkansas: 
Conway. 
Jefferson. 
Lonoke. 
Perry. 
Pulaski. 
Group 42. 
Alabama: 
Dallas. 
Lee. 
Lowndes. 
Okmulgee. 
Pope. 
Macon. 
Seminole. 
Group 37. 
Marengo. 
Montgomery. 
Group 30. 
Sumter. 
Mississippi: 
Wilcox. 
Oklahoma: 
Bolivar. 
Mississippi: 
Haskell. 
Claiborne. 
Lowndes. 
Le Flore. 
Coahoma. 
De Soto. 
Noxubee. 
Group 31. 
Texas: 
Parker. 
Palo Pinto. 
Tarrant. 
Group 32. 
Issaquena. 
Jefferson. 
Madison. 
Panola. 
Quitman. 
Sharkey. 
Sunflower. 
Tate. 
Group 43. 
Alabama: 
Baldwin. 
Clarke. 
Connecuh. 
Escambia. 
Monroe. 
Texas: 
Collin. 
Tunica. 
Warren. 
Group 44. 
Washington. 
Georgia: 
Navarro. 
Yazoo. 
Baker. 
Limestone. 
Arkansas: 
Bleckley. 
Falls. 
Chicot. 
Bibb. 
Travis. 
Cross. 
Calhoun. 
Crittendon. 
Crawford. 
Group 33. 
Desha. 
Dooly. 
Lee. 
Dougherty. 
Texas: 
Mississippi. 
Houston. 
Anderson. 
Phillips. 
Jefferson. 
Bastrop. 
Bowie. 
Poinsett. 
Johnson. 
St. Francis. 
Laurens. 
Brazos. 
Louisiana: 
Lee. 
Burleson. 
East Carroll. 
Macon. 
Cass. 
Madison. 
Marion. 
Caldwell. 
Tensas. 
Muscogee 
