Publication date refers to the date this particular version was published

The publication date (also called “Publish Date” and “Date Published”) shown for ebrary books refers to the date of the particular publication ebrary has, which is sometimes significantly later than the book was originally published.

So, for example, even though the book Moby Dick was first published over a hundred years ago, the ebrary metadata shows a publication date of 10/2009 – which is the date that this particular ebook version with this particular forward, etc. was published.