Re: Hawthorne -- As for novels, I'd suggest The House of the Seven Gables and The Scarlet Letter, but also The Marble Faun, which is often overlooked. It's a more subtle approach to the weird, but there are some truly magnificent passages. As for the short stories, I would particularly suggest: "The Minister's Black Veil", "Dr. Heidegger's Experiment", the "Legends from the Province House", "The White Old Maid", "The Birthmark" (which should be compared to Poe's "The Oval Portrait"), "Young Goodman Brown", and "Ethan Brand", though frankly the entirety of the Twice-Told Tales is well worth reading simply for its richness of imagination and subtlety.
As for Erckmann-Chatrian, you might want to look here:
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archive.org]
though, if memory serves, "The Man-Wolf" is somewhat abridged in this form. It can be found in its entirety at Project Gutenbberg....