From 'Atlas and Textbook of Human Anatomy', 1909, Vol. 1, fig.251, by Johannes Sobotta and J. Playfair McMurrich. Artist: K. Hajek or A. Schmitson. Retrieved from Sobotta's Anatomy plates at Wikimedia. Possible original source: Sobotta's atlas at Hathitrust Digital library.
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"Sobotta 1909 fig.251 - 12th rib and lumbal vertebra - English labels" by Johannes Sobotta is in the Public Domain.