In 1936 Haley published Charles Goodnight, Cowman, Plainsman,
In 1943, George W. Littlefield, Texan, a
biography of cattleman George W. Littlefield for whom the city of
Littlefield in Lamb County is named. He followed with Charles
Schreiner about the Hill Country rancher and landowner Charles
Schreiner, Sr. , Jeff Milton, A Good Man with a Gun in
1948, and Fort Concho and the Texas Frontier in 1952, a
reference to an early fortification in San Angelo.
His biggest seller was a political book he self published in 1964
called, A Texan Looks at Lyndon: A Study in Illegitimate Power
which eventually sold 7.5 million copies to become the most
successful political book of all time.