How to join end nodes of different paths in Inkscape?

I've been working recently on 3D printing TSP maps. I've included a pretty simple sample right here:

The issue is that when I try to manipulate this figure, it recognizes it as 25 separate sections. I thought that there may have been some node limit per object, but as it turns out, some of the sections were not properly joined (I only discovered this around 25000% zoom)

The end node shown is in the EXACT same position as the end node of the adjacent object not highlighted, but they are definitely different. (I can move each independently) I don't know how to join them, and the research I've done hasn't yielded much...I don't mind fixing it, but I don't know how.