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That's indeed unfortunate, but understandable. The author itself is cited sometimes in scientific articles (see here). -- Mdd (talk) 20:52, 30 January 2014 (UTC)[reply]
Some further research revealed the origin of the images used (the article mentions "Museum of Brooklyn Art and Culture" (??):
George H. Henshaw et al., "Discussion: Improvement of Sedimentary Rivers," Transactions, New York, American Society of Civil Engineers, May, 1889, p. 116.