Access to sources of information

It might not be necessary either. If you have access to the source and you can read it, then the idea is that the Wiki process will be able to properly interpret it.

Something else to keep in mind: people share. (Probably something we shouldn't tell the publishers.) I remember we had just one person with access to a huge research database working at one WikiProject. He would often look stuff up for other editors to help them work on articles. Send them stuff in email. A huge amount of work got done just because of one subscription. (Not saying we should buy one subscription and share it around. Just that people without subscriptions won't be as "in the dark" as you might guess.)