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The reference I consult most often is the latest edition of the annual Nihon Kahei Katurogu (Japanese Numismatic Dealers Association Catalog), followed by the 20th Century volume of the Standard Catalog of World Coins by Krause/Mishler/Bruce, and then - in this order - the 19th, 21st, 18th, and 17th Century volumes.
For more traditional "reference books", It's really a tossup between Japanese Coinage, 2d Ed., 1972 by Jacobs and Vermuele, and Coins of Japan, 1904, by Neil Gordon Munro.
Why? Because they contain the information I want to ascertain. Other than Krause, they are all vital for collectors of Japanese coins, and virtually useless for everyone else.
Of course I have quite a few other catalogs and reference library material covering my interests. I even own a Red Book that's less than 10 years old.
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Ethical conduct is being honest when no one is watching.
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