Ranches of Southwestern Custer County, South Dakota - Multiple Property Documentation Form Document Grades: Grade 5, Grade 7, Grade 8, Grades 9-12 View Resource Add To Collection Favorite About Standards National Register of Historic Places Form: Ranches of Southwestern Custer County, South Dakota - Multiple Property Documentation Form 5.SS.6; 5.SS.9; 7.SS.12; 8.SS.2;9-12.USH.13