No release dates have been set for any additional volumes.

Two additional volumes would be released in 1989 and 2002.

Four additional volumes have been published between 2002 and 2010.

Are you ready for the additional volume of communication that may be generated?

Following the issue of the four volumes, plans for an additional volume were initiated.

The cost of additional volume was not entirely offset by lower prices.

An additional volume was said to be in preparation up to the end of 1940.

Between the years 1890 and 1902 three additional volumes followed, which continued coverage of Spanish history up to 1516.

Two additional volumes based on his work were published in 1996 and 1999.

As of 1 March 2013, however, no additional volumes have been issued.