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How much are coins worth? The question is basic to the hobby, and there are many books that address the question.

One price guide for North American coins is David C. Harper’s “1994 North American Coins and Prices” (Krause Publications, $13.95).

Harper is especially helpful discussing trends to help hobbyists who have an eye to investment. The book is available in bookstores and coin shops or from the publisher, 700 E. State St., Iola, Wis., 54990.

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South Korea has issued a six-coin proof set to mark Expo ’93 held in Taejon. The coins celebrate Korea’s arts, crafts, industry and science. Expo attracted participation from 100 nations and the theme was preserving the environment.

Each proof set includes two gold coins, the 50,000 won”Tower of Great Light” and the 25,000 won Astronomical Observation Instrument;” three silver coins, a 10,000 won “wine jug,” a 5,000 won Farmers’ band,” and 5,000 won “Woman at spinning wheel.” A copper-nickel 1,000 won coin showing the Expo mascot and a rocket fills out the set.

The sets will sell for $1,595 from the American distributor, PandaAmerica, 3460 Torrance Blvd., Suite 100, torrance, Calif. 90503.

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Six persons make up the Citizens Commemorative Coin Advisory Committee.

The appointees are: David Ganz, president of the American Numismatic Assn.; Elvira Clain-Stefanelli, executive director of natural history at the Smithsonian Institution; Reed Hawn, prominent Texas coin collector; Elsie Sterling Howard of Miami; Danny Hoffman, a young coin collector from Laurens, S.C., and Thomas V. Shockley 3d, a Dallas businessman.