Question: What district of Japan does Toyoko Tokiwa cover in his book about Yokohama after World War 2?
Sentence (from "Occupation of Japan"): The occupation, codenamed Operation "Blacklist", was ended by the San Francisco Peace Treaty, signed on September 8, 1951, and effective from April 28, 1952, after which Japan's sovereigntywith the exception, until 1972, of the Ryukyu Islands was fully restored.
Relevant evidence: No