Since 1990,I have published a look at the evolution of SUE by the decade. This article is the third and probably final decade that I will look at, but hopefully someone will take up the challenge in 2030. The publications from 1990-2000 and 2000-2010 are included for reference at the end of this article. The publication from 1980-1990 was pre-internet and lost to me, but I think appeared in the former magazine Underground Focus.
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