Statistics for occurrence #1 of “Prof. Nat” in chapter 21, page 86 of Laura E. Richards, Maud Howe, Florence Howe Hall, Julia Ward Howe, 1819-1910, in two volumes, with portraits and other illustrations: volume 1:

...us Women ) was a small book, yet it stood for much careful work, and was so recognized and received. The recognition sometimes took a singular form, e.g., a letter from a gentleman styling himself Prof. Nat . & Geol., who desires two copies of the Margaret Fuller, and asks her to accept for them a choice selection of Lithological, Cabinet of Geological Mineral specimens, representing the Glacial, a...
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