And T$ has only hit the highlights of US coin valuation.
For the rest of the world there are
- the 5 phone-book sized volumes of the Standard Catalog of World Coins - more or less accurate for some countries, wildly inaccurate for others
- Individual country guides like Charlton's Canadian, the Japanese Numismatic Dealers Association Catalog, etc., also generally accurate only to the extent of relative value, and
- several of the guides mentioned by T$.
For all significantly valuable coins, US and world, the best and most accurate guides are realized prices at major auctions; and for more common coins realized prices at Ebay and other online auction sites.
Bottom line, you can't appraise a coin collection just by grabbing a universal reference book and looking up the individual pieces.
