The link below includes 1970-1980 and 1990-2000 crosswalks, but I can’t seem to find 1980-1990 anywhere.
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I am not aware of a crosswalk between the 1980 and 1990 IND values. The classification system between these two years is nearly identical. In general, the 1990 classification simply added a few extra detailed categories that were previously included in a broader category. For example, the 1990 sample adds “12: Veterinary Services”, which was included in the 1980 category “20: Agricultural Services, except Horticultural”.
Hope this helps.
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