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<p>[QUOTE=&quot;2manybooks, post: 405464, member: 8267&quot;]abebooks.com is the best site for getting comparative values. A well designed search page allows you to enter detailed information about the edition you have.</p><p><br /></p><p><a href="https://www.abebooks.com/servlet/SearchEntry?cm_sp=TopNav-_-Results-_-Advs" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.abebooks.com/servlet/SearchEntry?cm_sp=TopNav-_-Results-_-Advs" rel="nofollow">https://www.abebooks.com/servlet/SearchEntry?cm_sp=TopNav-_-Results-_-Advs</a></p><p><br /></p><p>As you have to pay a subscription fee to be on abebooks, the dealers tend to be more experienced and knowledgeable. </p><p><br /></p><p>The value of an inscription and signature does depend on the importance of the author, as you suggest. In the case of an obscure botanist (although he does merit a wikipedia page), it might increase the value by about $15-20, all other things being equal. You would have to wait for a buyer who actually cares, though.</p><p><br /></p><p>As for old law books, at least here in the U.S., they are generally worthless. Lawyers are interested in the most recent information, and few people are interested in the older texts as historical sources.</p><p><br /></p><p>As for pricing on Amazon, it is sometimes completely out of touch with reality. The prices you found are what I would call &quot;hail Mary&quot; prices - just somebody hoping someone is dumb enough to pay way more than a book is worth. On Amazon you can check the sales rank, to see if such a book is actually selling. But you can&#039;t tell what the last copy sold actually sold for. On ebay, look at the prices actually realized, rather than what somebody is asking.[/QUOTE]</p><p><br /></p>

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