The NLM Classification, available online at https://www.nlm.nih.gov/class/, moved from an annual spring update to twice-yearly updates. The 2017 winter version, published January 26, 2017, encompassed changes to the NLM Classification resulting from new and changed 2017 Medical Subject Headings (MeSH) terms as well as additional minor updates to the index and schedule. The 2017 summer version, now available, encompasses the systematic review of selected schedules and other miscellaneous updates.
For more information about the scope of the 2017 summer edition, see https://www.nlm.nih.gov/class/Scope.html
Contact NLM for further information, questions, or comments.