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Dear Akio Heine,
Thank you for sharing your question with the History Hub.
A search of the National Archives Catalog reveals several series of records related to the bulletins of the Joint Intelligence Center, Pacific Ocean Area (JICPOA). This file from the series Confidential, Restricted, and Unclassified Administrative Files, 1942-1945 in Record Group 313: Records of Naval Operating Forces, 1849-1997 is one example. There are also many files like this one in the series Records of Inactive Naval Stations, 1941-1945 in Record Group 38: Records of the Office of the Chief of Naval Operations, 1875-2006. Finally, the series Intelligence Library, 1945-1947 from Record Group 243: Records of the U.S. Strategic Bombing Survey, 1928-1947 also contains some bulletins. These records are in the custody of the Textual Reference Branch at the National Archives in College Park, MD (Archives II). You can contact them at email@example.com with questions about accessing the records.
Additionally, a search of Worldcat shows that several libraries have copies of the Bulletins you are interested in, including Nimitz Library at the Naval Academy and Cornell University Library in New York (among others). It does not seem that an online version is available.
Thank you, again, for posting your question, and best of luck with your ongoing research.