60

In his introductions to The Game Of Empire and The Night Face, Poul Anderson directly addresses his readers, that is to say you and me as we open these books. Thus, these are non-fictional introductions whereas a passage written as if by Hloch of Stormgate Choth as he addresses his fellow Avalonians is fictional. In this sense, the total number of works of fiction comprising Anderson's Technic History is greater than you think:

forty-three instalments, ranging from short stories to long novels;

twelve introductions and one afterword in The Earth Book Of Stormgate;

one original introduction in Trader To The Stars and three more in The Trouble Twisters.

Total: 60.

We might also count the fictional introduction to "The Star Plunderer" although I think that that accompanied the story when originally published as opposed to being added when the story was collected.

These additional passages are short but they impart information and enhance the series so they count.

What was a good series in any case becomes even better with these additions.