The success of the series added significant funds to the corporate balance sheet, and lead to further books on history being published.
Since the production of the game line ended, no further books are to be expected.
Between 1998 and 2004, Vikernes would write a further five books in prison.
A further book, Spycatcher 2, based on the series, was published in 1960.
Tereska wrote some further 14 books, which were often translated by her husband into English.
He published some further books of lectures on the theory.
There have been a further three books in this series.
Natalie Gordon wrote three further books between 2004 and 2005.
He wrote further books about the ethics of advertising in the late 1940s.
Jones and Jolliffe have also written three further books on film making.