大本営海軍部命令＝大海令 Daikairei, the command from Imperial General Headquarters to the navy. The first command was in Nov 5 1941, ordered Commander-in-Chief of the Combined Fleet (Yamamoto Isoroku) to prepare the war against US, UK and Netherlands. The book included the copy of all hand written commands from No.1 to No.57 and the commentary of each command.
 
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