2018 MeSH Data Files README The following files are from the 2018 MeSH Vocabulary download and are the ASCII formatted files. For more information on the MeSH Vocabulary files we would refer you to the following link: http://www.nlm.nih.gov/mesh/filelist.html To download regular MeSH files, please see the MeSH FTP Site: ftp://nlmpubs.nlm.nih.gov/online/mesh/ stree2018.bin - Not a MeSH vocabulary file. This file was created by us specifically for the Repository. The file contains a mapping of MeSH Heading to Semantic Type per the given year. The file was created using a combination of the d2018.bin "ST =" fields and relevent UMLS files (MRCON, MRSTY) appropriate to the given year.