Kroll, John J.
John J. Kroll was an alumnus of Michigan College of Mining and Technology (now Michigan Technological University) in Houghton, Michigan. After graduation he became a medical photographer and developed a method of producing photomicrograhs of chemicals, metals, rock sections, plant and human tissues. After his retirement, he produced these photomicrograhs as pieces of art, displaying in several exhibitions.
From the description of John J. Kroll Photograph Collection, 1930-1931. (Michigan Technological University). WorldCat record id: 717334838
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