LITERATURE CITED
- Goedert , J. L. 1988 . A new late Eocene species of Plotopteridae (Aves: Pelecaniformes) from northwestern Oregon. . Proceedings of the California Academy of Sciences , 45 : 97 – 102 .
- Hasegawa , Y. 1978 . [There were penguins in Japan also!]. Kagaku Asahi, [March 1978]:71–75. [In Japanese]
- Hasegawa , Y. 1979 . “ [A history of studies of Oligo-Miocene penguin-like birds]. Part 1 ” . In Hasegawa, Isotani, et al., Bulletin of the Kitakyushu Museum of Natural History 1 41 – 43 .
- Hasegawa , Y. and Isotani , S. 1979 . “ [Hatatsu specimens from Yukiaino Sand- stone Bed, Imari-shi, Saga Prefecture]. Part IV ” . In Hasegawa, Isotani, et al., Bulletin of the Kitakyushu Museum of Natural History 1. [In Japanese] 48 – 50 .
- Hasegawa , Y. , Isotani , S. , Nagai , K. , Seki , K. , Suzuki , T. , Otsuka , H. , Ota , M. and Ono , K. 1979 . [Preliminary notes on the Oligo-Miocene penguin-like birds from Japan (Parts I-VII)]. . Bulletin of the Kitakyushu Museum of Natural History , 1 : 41 – 60 . [In Japanese]
- Hasegawa , Y. , Okumura , Y. and Okazaki , Y. 1977 . [A Miocene bird fossil from Mizunami, Central Japan]. . [Bulletin of the Mizunami Fossil Museum] , 4 : 169 – 171 . [In Japanese]
- Hasegawa , Y. , Ono , K. , Otsuka , H. , Nagai , K. and Ota , M. 1979 . “ [Avian wing bones from Ainoshima Island, Kita-Kyushu, Japan]; Part VII ” . In Hasegawa, Isotani, et al., Bulletin of the Kitakyushu Museum of Natural History 1 55 – 60 .
- Hasegawa , Y. and Ota , M. 1979 . “ [Hikoshima specimens from the Orio Sand- stone Bed, Shimonoseki City, Yamaguchi Prefecture]; Part V ” . In Hasegawa, Isotani, et al., Bulletin of the Kitakyushu Museum of Natural History 1 51 – 52 .
- Hasegawa , Y. and Otsuka , H. 1979 . “ [Nishisonogi specimens from Nishisonogi Formation, Nagasaki Prefecture]; Part VI ” . In Hasegawa, Isotani, et al. Bulletin of the Kitakyushu Museum of Natural History 1 53 – 54 .
- Hasegawa , Y. and Seki , K. 1979 . [New fossil birds from the Orio Sandstone Bed, Northern Kyushu]; Part II, pp. 43–46 in Hasegawa, Isotani, et al. Bulletin of the Kitakyushu Museum of Natural History 1
- Hasegawa , Y. and Suzuki , T. 1979 . “ [Left femur from Asagi Sandstone, Fukushima Prefecture]; Part III ” . In Hasegawa, Isotani, et al. Bulletin of the Kitakyushu Museum of Natural History 1 46 – 48 .
- Howard , H. 1969 . A new avian fossil from Kern County, California. . Condor , 71 : 68 – 69 .
- Olson , S. L. 1980 . “ A new genus of penguin-like pelecaniform bird from the Oligocene of Washington (Pelecaniformes: Plotopteridae) ” . In Papers in avian paleontology honoring Hildegarde Howard. Contributions in Science Natural History Museum of Los Angeles County 330 Edited by: Campbell , K. E. Jr. 51 – 57 .
- Olson , S. L. and Hasegawa , Y. 1979 . Fossil counterparts of giant penguins from the North Pacific. . Science , 206 : 688 – 689 .
- Olson , S. L. and Hasegawa , Y. 1980 . [Fairy-tale-like penguins that lived in Northern Hemisphere: search for the mystery of fossil birds of 30,000,000 years ago]. . Anima , 92 : 59 – 66 . [In Japanese]
- Olson , S. L. and Hasegawa , Y. 1985 . A femur of Plotopterum from the early middle Miocene of Japan (Pelecaniformes: Plotopteridae). Bulletin of the National Science Museum, Tokyo . Series C , 11 : 137 – 140 .