The first volume was released at 1960 and the second in 1963.
The second volume was released several years after the first.
The second volume was then released on March 28, 2008.
Over 80 volumes have been released since the beginning of the project in 1987.
Three volumes have been released in the series so far.
The final volume of the series was released in April 2006.
The final volume will be released on July 10, 2012.
As of May 2013, no further volumes have been released.
The second volume in the series was released on June 2, 2012.
The third volume in the series was released on September 1, 2012.