We’ve recently encountered a discrepancy in the subjects returned by the Crossref REST API, specifically when comparing results from the Public and Polite API responses.
There are a number of known issues with the subject values in the REST API. Because of that, we’re looking into how we can either remove them entirely or replace them with something more flexible and updatable.
I don’t see this specific discrepancy noted though, so I will pass that example along to our metadata retrieval product manager and technical team.
I wanted to follow up on your message to us from September to let you know that we have removed the ASJC subject codes from our REST API. We’re no longer asserting subject areas/codes for your journals/journal articles.