These four soft cover pamphlets from the 1950-through 1970's
have a value of $2.00 to $5.00 each as ephemera, or paper collectibles.To finish, I will need you to click the five stars at the top right of your screen and hit the green submit button, thanks!
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I have found a few of them. These were published at Cambridge in 1970, I have even had one once.
I was unable to sell it at 9.99 and passed it along in a book lot to an auction.
There was also an Ebay seller that had one in August, and attempts at selling at $59 and $39 were unsuccessful.
The digital copy services make their money by charging well for digital copies of out-of-print or self-published
items, but this can't be used as a value comparison to a printed book since it is more of a service rather than a tangible item.
Do click the stars for me, thanks!