Perhaps also check out KWF's introductory comments under How Long is a League, and (within that commentary) her remarks concerning the Blue Mountains (Atlas of Middle-Earth).
Not that her book is perfect (nor does she claim so), and it could not be approved by JRRT of course, but I think this would be an important concern for her book overall. She not only provides a scale of miles for her FA map, but also mapped the Far North, where Christopher Tolkien himself would not go (for his Silmarillion maps).
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