Ephraim Morgan Governor's Papers, General Correspondence 1921/08-1921/09
Miners Conspiracy Indictment, Logan County
Miners' Treason Trials, Records
Justus Collins Papers, Baldwin-Felts Detective Agency material
Report of the Adjutant-general of the army to the secretary of war, 1920/21
Fictionalized account: Denise Giardina, Author, Papers
William Blizzard Trial Transcripts
William C. and Bill Blizzard When Miners March Collection
Harold Houston to Everett Early, August 9, 1921
Correspondence, Logan Coal Operators Association
Transcripts of Interviews Even the Heavens Weep (some interviews are with people at Blair Mountain)
Library of Congress Oral Histories
The Battle of Logan County by Art Shields (starts on page 16)
Newspapers - when searching make sure your start date is 1921. You can limit your search to West Virginia or search papers across the country (this is under advanced search)