How To Find When A Book Was Published?

I don't suppose this could be it?:

Spencer, Herbert

EDUCATION: Intellectual, Moral and Physical
A.L. Burt NY 1900 12mo - over 6" - 7" tall Hard Cover Very GoodNo
Date. 1861 written on title page.??. Hard Cover, VERY GOOD green
boards, 309 pp.+adverts.. . Opinions and explanations about the worth
of knowledge and education.

Doreen Stephens Books (Canada)     $20.85AUD

If this looks similar to your book, you can try this link:
http://www.booksandcollectibles.com.au/book.php3?book_id=222402051&

There are contact details for the seller and you could try emailing them to see if your two books are a match?

The Online Library of Liberty may help... Ummm, honestly I can't seem to find any information on it. You may need to go to a rare book dealer to get more info on it. I also found this link that might help. Good Luck! Also, ISBN # are fairly new, and most books that are over 30 years old [and some newer] don't have ISBNs for their original publication.

Works of Robert Burns by allan Cunningham

Look in wikipedia... :)

Look in wikibooks