Kosai, H.
Volume	Paper Title	Page Number	Authors
17	Organized Observations of Night Sky Brightness in Japan	35	Kosai, H.; Isobe, S.
63	Activities of Asteroid Studies by Amateur Astronomers in Japan	297	Kosai, H.; Urata, T.; Nakamura, T.
139	Star Watching Observations to Measure Night Sky Brightness	175	Isobe, S.; Kosai, H.

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