Any natural history collection is free to implement persistant semantic web compatible URIs for its specimens so it can be difficult to keep track of who has implemented them and to what level they are implemented. Below is a list of some we know about that may be useful to look at. Some of these may have been created totally separately from any of the things mentioned in the documentation.
For a list of institutions who are participating in the CETAF Stable Identifiers initiative see the list on the CETAF website.
The list below is not intended to be exhaustive but if an institution is missing and you would like it to be included please get in contact so we can add it.