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We prove that if two graphs of girth at least 6 have isomorphic squares, thenthe graphs themselves are isomorphic. This is the best possible extension ofthe results of Ross and Harary on trees and the results of Farzad et al. ongraphs of girth at least 7. We also make a remark on reconstruction of graphsfrom their higher powers.

Uniqueness of graph square roots of girth six