The Edward T. LeBlanc Memorial Dime Novel Bibliography

Edition - The Bradys and Dr. Dockery; or, The Secret Band of Seven - Secret Service edition, first appearance

(source: Stanford Libraries)
Online Full Text: Stanford Digital Repository
Series: Secret Service: Old and Young King Brady, Detectives no. 270
Item: The Bradys and Dr. Dockery; or, The Secret Band of Seven
Author: New York Detective (pseudonym used by multiple people)
Date: March 25, 1904
Publisher: Frank Tousey (New York (N.Y.): 24 Union Square) -- United States