Keywords: Martinus Beijerinck.png Martinus Beijerinck in his thirties or forties Picture taken in the 1880s or 1890s by an unknown photographer http //www tnw tudelft nl/live/pagina jsp id 06295a93-a197-4d4a-8c02-3f0f867382be lang en Author s 1880 or 1890s PD-old PD-US Martinus Beijerinck Location not applicable |