It is really more about how much time you wish to devote to the sale of your issues AND the method by which you wish to sell them, i.e. all at once, by decade, by year, or individually AND how: locally, Craig's list or eBay, etc.
The link provided here outlines eBay sales. About 1/3 the way down the article you'll find "1960's" value, however, you'll discover by searching eBay, many sellers attempt to sell their issues at far higher prices, and some at lower prices.
This takes us full circle back to "the method by which you wish to sell them:"
Hope this helps!
Note: at the top left margin on the home page of this web site is a "dealer's directory."