Because it is an academic work and research in Germany, publications are written in the German language, unfortunately. Markus Lenz is still working on new publications in the English language. But it takes a lot of time. Note, after 70 years it's very difficult to find people who can give information about the Trolley Mission. And, for a German author, it's even more difficult to understand relationships and infrastructure of the United States Air Force in 1945. But so far, there are some English books available on bookstores.
The Trolley Mission 1945
Germany, 24 Hours After World War II
E-Book, english, Kindle edition, 28.444 KB