What is a set 1-20 of 1993 new standard encyclopedia worth?

The value of a 1-20 set of 1993 new standard encyclopedias depends on the condition of the set. Prices can range anywhere from $60-$600 retail online. The best way to know for certain is to take the set to an authorized appraiser who can tell you exactly what this particular set is worth and how much it can be sold for.