I remember many years ago seeing Hastings Encyclopedia of Religion go on PrePub and it just sat there. That truly astonished me, because I have never come across a work so jam packed with interesting and useful material. Hastings also wrote a Dictionary, and it likewise is has great articles with excellent information. They were produced around the same era that the 1911 Britannica was published (earlier though, I'm pretty sure). They have a similar kind of depth and breadth.
Please resurrect the attempt to add these to the Logos stable. And users, if you aren't familiar with these resources, do yourself a favor and take the time to find out more. This is one of those cases where not knowing what you're missing is truly unfortunate. The encyclopedia is a large multivolume work, but I guarantee you will be amazed at the depth of the articles. I would trade almost any item in my Portfolio for these two works.