The Edward T. LeBlanc Memorial Dime Novel Bibliography

Edition - The Bradys in the Coal Mines; or, The Mystery of Shaft No. 10 - Secret Service edition, first appearance

Online Full Text: Internet Archive
Series: Secret Service. Old and Young King Brady, Detectives no. 622
Item: The Bradys in the Coal Mines; or, The Mystery of Shaft No. 10
Author: New York detective (pseudonym used by multiple people)
Date: December 23, 1910
Publisher: Frank Tousey (New York (N.Y.): 24 Union Square) -- United States