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GH1871 should not be associated with Reformed Presbyterian Church of North America. https://www.hymnary.org/denomination/322
I have reviewed the associated hymnal via archive.org https://archive.org/details/gospelhymns00broo/mode/2up and do not see a source for the correct denomination. I do know, albeit not an expert of RPCNA history, that this work is unlikely associated.
https://archive.org/details/gospelhymns00schogoog/page/n7/mode/2up
Here is a second upload by Harvard, where Presbyterian Church in the U.S.A. (Old School) is associated.
Wikipedia (being that I cannot access some of the sources) shows Brookes to be Presbyterian and I do not see RPCNA ties in his background. https://en.wikipedia.org/wiki/James_Hall_Brookes#:~:text=James%20Hall%20Brookes%20(February%2027,a%20career%20spanning%2043%20years.
I hope to fix this association when I get editor access. I wanted to post here to documentation or further discussion.