1.

図書
図書
1. The American ephemeris and nautical almanac for the year 1971
issued by the Nautical Almanac Office United States Naval Observatory, Her Majesty's Nautical Almanac Office Royal Greenwich Observatory
出版情報: Washington : U.S. G.P.O., 1969
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2.

図書
図書
2. Explanatory supplement to the astronomical ephemeris and the American ephemeris and nautical almanac. 3d impression with amendments
prepared jointly by the Nautical Almanac offices of the United Kingdom and the United States of America
出版情報: London : Her Majesty's Stationery Office, 1974, c1961
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