Hi Emily,
It looks like all the sources using these particular labels are private sources. For private sources listed on the label pages, you can only see the sources' names.
If you can find these private sources on the front page map as well, clicking on the source's map marker can list a little more information. For example, "2 - very pale bleaching" has one source with Thai in the name, so you may be able to find the source's map marker around Thailand.