Note 3 — Chapter VII
Reading edition
It is interesting to remember that Captain von Papen had in the earlier part of the year, while he was still in Mexico, conducted an investigation into the types of explosives used in Mexico for similar enterprises. This investigation had been undertaken at the request of the German Ministry of War. Letters regarding this matter were found in Captain von Papen’s effects by the British authorities, and are printed in the British White Papers, Miscellaneous No. 6 (1916).