r32's went from july 1989 to around may 1994, they had 2 series, the transition was on aug/1990
r33's started in 1993, there was a lil overlap with r32's. the r33's had 3 series... not including an unofficial series 1.5 which had a lil of s1's and a lil s2's.
r34's came after that. I'm not that sure of any series but search th forums you might find it.