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In Plain Sight: Felix A. Sommerfeld, Spymaster in Mexico, 1908 to 1914

Felix A. Sommerfeld and the Mexican Front in the Great War

The Secret War on the United States in 1915: A Tale of Sabotage, Labor Unrest, and Border Troubles

Secret War Council

The German Fight Against the Entente in America in 1914

Im Schatten der Oeffentlichkeit: Felix A. Sommerfeld, Geheimagent in Mexiko, 1908 bis 1914

The Pen That Set Mexico on Fire: The Betrayal of Ricardo Flores Magon During the Mexican Revolution

Abraham Lincoln and Mexico

A History of Courage, Intrigue and Unlikely Friendships

Guns, Grit, and Glory: How the US and Mexico came together to defeat the last Empire in the Americas

The Negotiator's Toolbox: Winning Strategies for Corporate Buyers and Small Businesses

federal Bureau of Investigation before Hoover

Volume 1: The fBI and Mexican Revolutionists, 1908-1914