text: user29: 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?
  
  user7067: The UCSC Genome Browser downloads page has old human genome assembly versions way back to the first human genome ever published (by UCSC in 2000).
  http://hgdownload.soe.ucsc.edu/downloads.html#human
  We also have a variety of archived dbSNP data up to dbSNP141 on hg38, dbSNP 131 on hg37, dbSNP126 on hg18:
  http://hgdownload.soe.ucsc.edu/goldenPath/hg38/database/snp141.txt.gz
  http://hgdownload.soe.ucsc.edu/goldenPath/hg19/database/snp138.txt.gz
  http://hgdownload.soe.ucsc.edu/goldenPath/hg18/database/snp126.txt.gz
  They're in a custom table format, which can be turned into VCF manually.
  You can also get all of this data from Table Browser and add filters, etc.:
  http://genome.ucsc.edu/cgi-bin/hgTables
  
original_text: 29: <p>For benchmark purposes I’m trying to find an old version of the human reference genome (pre-GRCh37) and a matching version of dbSNP.</p>
  
  <p>Unfortunately it appears as though older versions of dbSNP aren’t archived, or at least these archives are not publicly accessible.</p>
  
  <p>In particular, <a href="ftp://ftp.ncbi.nlm.nih.gov/snp/organisms/archive" rel="nofollow noreferrer">the NCBI FTP archive</a> is fairly sparse. The only pre-GRCh37 version it contains is ostensibly <a href="https://www.ncbi.nlm.nih.gov/projects/SNP/snp_summary.cgi?build_id=124" rel="nofollow noreferrer">dbSNP build 124 from January 2005</a>, for hg17 (NCBI build 35). Unfortunately <a href="ftp://ftp.ncbi.nlm.nih.gov/snp/organisms/archive/human_9606_b124_NCBI35/" rel="nofollow noreferrer">the corresponding FTP folder is actually <em>empty</em></a>. 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 <a href="https://www.ncbi.nlm.nih.gov/projects/SNP/snp_summary.cgi?build_id=138" rel="nofollow noreferrer">official page</a> does not contain this rather crucial bit of information).</p>
  
  <p>Is there another authoritative source of this data?</p>
   7067: <p>The UCSC Genome Browser downloads page has old human genome assembly versions way back to the first human genome ever published (by UCSC in 2000).
  <a href="http://hgdownload.soe.ucsc.edu/downloads.html#human" rel="nofollow noreferrer">http://hgdownload.soe.ucsc.edu/downloads.html#human</a></p>
  
  <p>We also have a variety of archived dbSNP data up to dbSNP141 on hg38, dbSNP 131 on hg37, dbSNP126 on hg18:
  <a href="http://hgdownload.soe.ucsc.edu/goldenPath/hg38/database/snp141.txt.gz" rel="nofollow noreferrer">http://hgdownload.soe.ucsc.edu/goldenPath/hg38/database/snp141.txt.gz</a>
  <a href="http://hgdownload.soe.ucsc.edu/goldenPath/hg19/database/snp138.txt.gz" rel="nofollow noreferrer">http://hgdownload.soe.ucsc.edu/goldenPath/hg19/database/snp138.txt.gz</a>
  <a href="http://hgdownload.soe.ucsc.edu/goldenPath/hg18/database/snp126.txt.gz" rel="nofollow noreferrer">http://hgdownload.soe.ucsc.edu/goldenPath/hg18/database/snp126.txt.gz</a></p>
  
  <p>They're in a custom table format, which can be turned into VCF manually.</p>
  
  <p>You can also get all of this data from Table Browser and add filters, etc.:
  <a href="http://genome.ucsc.edu/cgi-bin/hgTables" rel="nofollow noreferrer">http://genome.ucsc.edu/cgi-bin/hgTables</a></p>
  