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2 results for: prominent central vein

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Six microscopic enlargements of minerals, page, photomechanical print, Image 1 is diabase, 2 is
LZT26B00_224

Six microscopic enlargements of minerals, page, ph...

Two oak leaves, page, photomechanical print, number: 'Fig. 113.', photographer: Alois Auer, cliché
LZT26B00_176

Two oak leaves, page, photomechanical print, numbe...