The drawing appears to be a preliminary sketch for Nimmo Moran's etchings Twilight 14.70 [small plate] and Twilight, East Hampton 14.104a-h. Sandra Pauly, Henry Luce Foundation Curatorial Scholar for Moran Collection Research 4.7.22
Moran, Mary Nimmo. Sketchbook late 19th century: East Hampton. 18.6.27. July 2, 1880. Tulsa: Gilcrease Museum, https://collections.gilcrease.org/object/18627.
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