F1R is the Formula 1 Register who published a series of books from the mid-1970s covering Formula 1, Formula 2, Formula 3, Formula Junior (I think) and even Formula 5000. Their work is excellent and groundbreaking but suffers a couple of weaknesses: that sources for their knowledge are not shown and that car identification is sometimes extrapolated from a single sighting to a whole season.
Because of these issues, Wolfgang Klopfer, Chris Townsend and I reworked Formula 5000 completely from original sources. I had already done the 1966-1985 period of F1 completely independently and Chris has now started to do F2 from original sources as well.
We do use F1R sources for some things, notably recently the chassis numbers they give in their F3 books as these are noted only for certain races, making us confident that they were contemporary observations.
Allen
PS Chris has beaten me to it!
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