Source list for layered citations

I would appreciate clarification on appropriate Source List entries for layered citations – at least I assume this scenario should be a layered citation. I am documenting genealogy research. A nearby historical society website has an online index which you can use to search for references in their newspaper collection. This newspaper collection contains papers in print and microfilm formats.  

I asked the historical society to locate an article identified by their online index. They provided me a digital copy of the article. The information on the newspaper is in my reference note, but I also decided to add where the copy of the newspaper article was obtained. My thought process in adding where the copy of this newspaper was obtained is that 1) I doubt this newspaper is generally available and 2) I want to remember where I located it in case I want to refer to this paper again. Am I wrong to add this info?

When it came time to create to the Source List entry, I initially thought I would cite the newspaper directly. However, now I wonder if I should cite the historical society newspaper collection instead. Or, do I need to add both to the Source List?

Here is the Reference Note I created:

“A List of Letters,” (Columbia) Missouri Intelligencer, 4 October 1834, p. 3, col. 2; newspaper collection, State Historical Society of Missouri, Columbia.

Here is the Source List entry I created:

Newspaper Collection. State Historical Society of Missouri, Columbia.