| Reference No.: S1910010600102 | Mr Koga's achievements in the Ryukyu Islands (4) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910010700102 | Mr Koga's achievements in the Ryukyu Islands (5) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910010800102 | Mr Koga's achievements in the Ryukyu Islands (6) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910010900102 | Mr Koga's achievements in the Ryukyu Islands (7) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910011100102 | Mr Koga's achievements in the Ryukyu Islands (8) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910011400102 | On receiving good news about Koga Tatsushiro Ryokudo (Ryukyu Shimpo) |
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| Reference No.: S1910011400202 | Mr Koga's achievements in the Ryukyu Islands (9) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910041400102 | Schools Inspector Hata returns to Naha (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910042500102 | Recruiting migrant workers for the Senkaku Islands (Ryukyu Shimpo) |
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| Reference No.: S1910050900102 | Recruitment advertisement for migrant workers, etc. (1) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910062900102 | Recruitment advertisement for migrant workers, etc. (2) (Okinawa Mainichi Shimbun) |
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| Reference No.: S1910072300102 | More treasures revealed in the Senkaku Islands (Ryukyu Shimpo) |
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| Reference No.: S1910080800102 | Nitrogen fertilizer in the Senkaku Islands (Ryukyu Shimpo) |
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| Reference No.: S1912110000103 | Okinawa Fisheries Survey (1) Okinawa Prefecture Fisheries Group 1 |
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| Reference No.: S1914000000103 | Phosphorus ores on Rasa Island |
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| Reference No.: S1914030300103 | History of Japanese Fisheries |
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| Reference No.: S1914040000103 | Survey map of distances within Okinawa Prefecture (Ryukyu Shimpo) |
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| Reference No.: S1916040000103 | Okinawa Kenchi Yoran [Handbook of Okinawa Prefectural Administration] |
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