With the limited amount of information available there are a number of possible answers...
1) it may never have been formally copyrighted
2) it may have been intended to be "copyright free" (Public Domain)
3) it may have been written/published after 1989, when copyright notices were no longer necessary.
4) it may have been a government subsidized work
5) the copyright may have expired.
The year of the encyclopedia is the year of the copyright; there are far too many editions to answer this question directly.
No copyright date is given in the book. It would be between 1888 (the year its prequel, The Hidden Hand was published) and 1899 (the year Southworth died). It is in the public domain.
The copyright date is the year the text was completed. It may or may not be the same as the publication date.
1967- copyright renewed 1995
Assuming tha you mean book 1- 'Artemis Fowl,' the copyright date is 2001, as stated in the book.
The copyright date for "Eragon" by Christopher Paolini is 2002.
The copyright date of the original book is July 24th, 1954The copyright date of the movie is December 19th, 2001The copyright date of the video game is September 24th, 2002
A corporate entity would not have a copyright date.
2006.
1977.
1971.
1990.