I have been trying to compare outlines of reigns throughout 1-2 Kings and it seems that even though the browser allows me to enter any range I want (I could do Gen-Rev if I wanted to), it only produces one book. Upon further investigation, it would seem that the reason for this is that the resources the browser queries has outlines for different books in different places (ie, that of Genesis under discussion of Genesis, that of Exodus under Exodus, etc.). So if a resource like OT Survey has it all in the resource and I type Genesis-Deuteronomy, I will only get Genesis. But I will get in the resource list, resources on the other books of the Pentateuch. So I can toggle, as it were between outlines of different books in my range, but not view all the pertinent outlines from one resource (i.e., there will be no OT Survey outlines for Ex-Dt even though the resource contains them). Moreover, this means that I cannot see a continuous outline for sections of Scripture that have a continuous story (e.g., the "Primary History," Luke-Acts,* 1 & 2 Kingdoms, etc.).
* I realise that in this case, there is the added challenge of the fact that the two books are not contiguous in the canon.
I don't know whether it would be difficult to do so, but if not, it would be better to be able to see whatever of the range one enters that is found in the same resource.