Joint pseudonym of Mildred A. Wirt, W. Bert Foster, and Edward Stratemeyer. For works of these authors written under their own names, as well as other names used by them, search also under Wirt, Mildred A. (Mildred Augustine), 1905-2002;  Foster, W. Bert (Walter Bertram), 1869- ;  Stratemeyer, Edward, 1862-1930