Sepia-tone photograph roughly 4 by 6 inches in a paper folder. A nice portrait of this Danish chemist, who discovered the pH scale for measuring acidity. Crease to upper left corner of image (not affecting portrait) in a very good paper folder. Boldly signed below the image by Sorensen. Bookseller Inventory #
Title: [Signed Photograph of S. P. L. Sorensen]
Publication Date: 1930
Book Condition: Very Good
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