Thank you for making your question to JustAnswer. My name is*****'m an Antiques Expert and I will try to help you with your particular inquiry. Please, don't hesitate to contact me any time or to make follow up questions if needed.
Loudon's Natural History. Popular descriptions, tales and anecdotes of more than five hundred animals
by Loudon, J. C. (John Claudius), 1783-1843; Dallas, W. S. (William Sweetland), 1824-1890
Regarding the value of your item, I have just perform a market research of similar sold items as yours. I performed the research based upon the most recent finished auctions and private sells, so the value given is the real market value of your item. This is the only way to know the exact value of your unit.
The value will be in the range of 50-80$.
I'm sorry if the value provided is not as high as expected but I have to be honest and professional with you so you won't loose your time and efforts.
Please, use the stars to rate my answer or let me know if I can help you any further!