Oliver Strange wrote 10 Sudden books (in order of storyline, below)
Sudden--Outlawed (1935)
Sudden (1933)
Sudden--Gold Seeker (1937)
Sudden Rides Again (1938)
Sudden Makes War (1942)
Sudden Takes the Trail (1940)
Sudden Plays a Hand (1950)
The Marshal of Lawless (1933)
The Range Robbers (1930)
The Law o' the Lariat (1931)