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On the page for Elizabeth Gaskell, it lists the title "Mighty God, the First, the Last." But when you click that link, it goes to the page for that hymn, where WILLIAM Gaskell is shown as the author.
Most of the hymnals we've gone through have William Gaskell as the author of "Mighty God, the First, the Last", however the hymnal "Christian Praise" (1880) attributes it to Elizabeth Gaskell. That is why it shows up under her name.