Neil Grindley, head of resource discovery at Jisc, on [challenges surfacing open content in large library collections](https://www.jisc.ac.uk/blog/the-open-access-needle-in-the-discovery-haystack-21-oct-2019), on:
> Yet another (perhaps surprising) issue is that there has not historically been a standard way of flagging whether something is open access in a MARC format record.
Apparently there's a [new agreement](http://www.loc.gov/marc/bibliographic/bd856.html) to include an OA flag in a MARC record. Finally.