One must assume that, as mortals, Dwarf-lore was not as inaccessible to Men as the heights of Elf-lore might have been, and Men and Dwarves maintained friendship even when Men and Elves became estranged. The toy-market of Dale was the wonder of the North - were these 'magical' toys purely of Dwarven construction? The Men of Dale in particular payed well for their sons to be apprenticed to Dwarves, so there must be something in that regard. I think Dwarven secrets ('inner names', their secret alphabet of pictograms etc) were more a matter of culture, whereas the inaccessibility of Elf lore was more a question of time.
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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