| National Museum of Nature and Science Monographs | date of publication | 
    
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      | National Museum of Nature and Science Monographs No.50 |  | 
    
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      |  | Yasunari Shigeta, Masataka Izukura and Tomohiro Nishimura | February 2019 | 
	
		|  | Campanian (Late Cretaceous) ammonoids and inoceramids from the Ribira River area, Hokkaido, northern Japan |  |