Companeros — Tom W. Blackburn

1978 copyright book by Tom W. blackburn. Blurb says: "Spencer Stanton Built Empires and his greatest pride was the sprawling, abundant Corona spread, and Tito, the strong and honest son who helped him work it. So when two trail-broke Johnny Rebs rode up to the Corona no one guessed this was the beginning of a family feud that could pull down an empire and drench a small and worthless piece of desert Malpais with blood. Because no one knew that Tito Stanton wasn't the only son... And only the action of Tito's whiplash guns could divide the good blood from the bad and reunite the Stanton family.