Psalms that repeat

If recurrence is significant then we must consider why there are certain psalms that repeat - especially as we are in a section of psalms related to geography and tribe. And one of these repeats. There is a preliminary structural model here - it is not successful in revealing pattern but it does show that the large repetitions: 14 - 53 and 60 - 108 are spaced like four part walls in the gallery. I wonder if they surround any set of things that could be perceived with some helpful coherence.