Question & Answer Series 141 Petit Trianon Series

Q: According to your website this book cover is referenced as 1897 book, but inside this one shows copyright 1895.

Could you explain this for me?
Poe
A: The copyright date is not necessarily the date of publication. In this instance, your book which is part of the publisher’s Petit Trianon Series was published in 1897. For books of this series, the cover changed every year or so. Thus, the year can be determined by the cover. These yearly covers are shown on the series website.

See: http://www.henryaltemus.com/series/series141.htm