- Best buy on Logos yet! Using it for my PhD research for Union School of Theology and it has been extremely helpful. The fact that you cannot search within the document can be alleviated by simply copying and pasting the document you select into a Word document and then searching it from there (just remember to include all the possible spellings). I have been introduced to some of the most cogent Biblical thinkers I have ever read. The amount of material one gets for the price makes this a steal! I also recommend the Library of Early American History collection.