SIC90 is SIC92. Back in the early
90s, SSD was not able to use codes with decimal points etc., so it was translated
into 3 digit codes by LFS. It's now part of SSD harmonised code, but most
surveys don't use it. I have tracked down documentation which shows the correspondence
between SIC92 and SIC90. However, it's so old that I can't trace an electronic
version of it. I'll have it photocopied and send it by post.
