1. Wanderings: from Galicia to Honolulu and back
2. Business, politics, and coal
3. Business tycoon and Republican leader
4. National politics
5. One of the most dangerous German agents in America
6. Dreams and ruin
7. The senator from Honolulu
8. The last chapter: America again.
The most dangerous German agent in America : the many lives of Louis N. Hammerling by Mieczysław B. Biskupski. ISBN 9780875807218. Published by NIU Press in 2015. Publication and catalogue information, links to buy online and reader comments.