* Condition: Is the set in good condition, with no tears, stains, or missing pages?
* Completeness: Does the set include all volumes, the index, and any supplemental materials?
* Rarity: Are there any special editions or unique features that make the set more desirable?
* Demand: How popular are vintage encyclopedias in your local area?
Here's how you can try to find the value:
* Check online auction sites: Sites like eBay and Etsy often have listings for vintage encyclopedias. Look at similar sets and their selling prices.
* Consult with an appraiser: A professional appraiser can give you a more accurate estimate based on the condition and rarity of your set.
* Look at antique and book dealer websites: Some dealers specialize in antique books and may have pricing information or be willing to give you an appraisal.
Remember:
* The value of a 1960 World Book Encyclopedia set is likely to be lower than a newer set due to its age and the availability of more up-to-date information.
* It's important to be realistic about the value of your set and not expect to get a high price unless it's in excellent condition and is particularly rare or desirable.