"Schools in the bituminous coal regions of the Appalachian Mountains."; "Deffenbaugh, W. S. (Walter Sylvanus), 1872-"; "Schools--Appalachian Region.", "Education--Appalachian Region."; "Deffenbaugh, W. S. (Walter Sylvanus), 1872-"; "1920"; "Serial issue. Issued as: United States. Bureau of Education. Bulletin, no. 21 (1920)."; ""; "P5752"; "pec"; "Education--Appalachian Region.", "Schools--Appalachian Region."; "14256"; .