For benchmark purposes I’m trying to find an old version of the human reference genome (pre-GRCh37) and a matching version of dbSNP.
Unfortunately it appears as though older versions of dbSNP aren’t archived, or at least these archives are not publicly accessible.
In particular, the NCBI FTP archive is fairly sparse. The only pre-GRCh37 version it contains is ostensibly dbSNP build 124 from January 2005, for hg17 (NCBI build 35). Unfortunately the corresponding FTP folder is actually empty. dbSNP build 138 has been “removed to recover storage”, whatever that means, and I’m unclear which version of the human reference genome it refers to (its official page does not contain this rather crucial bit of information).
Is there another authoritative source of this data?