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| Series | Hydrogeological Maps of Japan |
| No. | 18 |
| Map Name | Yamakuni and Yakkan River Basins, Fukuoka and Oita Prefectures |
| Scale | 1:50,000 |
| Author | TAKAHASHI Shigeru |
| Publish Year | 1969 |
| Publisher | Geological Survey of Japan, AIST |
| Price | ¥660 ( Purchase Guide ) |
| Prefecture | |