Huh, I hadn't noticed those partials there, and don't really understand what they were doing -- I guess they were supposed to be providing refworks/endnote export? Oops, I confess I hadn't even noticed them, but apparently they weren't. 

Yes, I guess the references to them should be removed. And I think it is appropriate for this logic to be here in BL, not in `blacklight_marc`, as the logic is not specific to MARC, rather it's for any SolrDocument that provides the relevant exports, however they do. (You can certainly translate to EndNote from way more than just Marc). 

i'll remove em, hopefully that's okay.