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I've seen collectors pay up to $20 for an individual copy they may be searching for. I've also seen them go year by year for $80- $100 that's unbound copies. 80 years = $6000 - $8000
The binding alone cost $35 per volume - 100 odd volumes = $3500.
So, to be honest the price is really what someone is prepared to pay to have access to this collection of astronomical and space information and enjoy seeing it presented on their shelf/ shelves.
Drop me a PM if you want to discuss further.
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