[Talk-us] Is summit register something that is often found in USA mountains?

[Mateusz Konieczny]

Is summit register something that is often found in USA mountains?

("A summit book or summit register is a record of visitors to the summit
of a mountain. It is usually enclosed in a weatherproof, animalproof metal canister.")

I am asking as I plan to implement summit register part of 
https://github.com/westnordost/StreetComplete/issues/561 and I wonder
whatever it makes sense to ask this question in USA.

So far this kind of object is not mapped at all in USA ( 
https://taginfo.openstreetmap.org/keys/summit%3Aregister#map )
but https://en.wikipedia.org/wiki/Summit_register claims
"The Sierra Club places official registers on many mountains
throughout California and the United States." (with quite weak source)
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