A supplement by the same author was published in 1906.

A supplement to the third report was also published on 30 January 1984.

This supplement was published not long after the box set.

Along with the above, the group also publishes several supplements for their magazines.

Two further supplements were published in 1743 and 1755.

One supplement was published, but nothing further was done with the game.

To this work a supplement was published in 1803.

The game, and many supplements, were published from 1983 until 1987, when the license lapsed.

From 1979 to 2002 a supplement entitled Archeoastronomy was published.

Two cumulative supplements were published from 1936 to 1939.