This package contains some ribosomal RNA BLAST databases distributed as part of the NCBI C Toolkit that are too large and specialized to include in ncbi-data. Specifically, it contains the databases Combined16SrRNA_2-12-2008, LSURef_93.fasta, and SSURef_93.fasta, along with an alias file to facilitate searching all three of them in conjunction with the 16SCore database included in ncbi-data.