13502606 - Justus von Liebig, combustion apparatus13387182 - George Carver, US agriculturalist, in a laboratory, USA13387181 - George Carver, US agriculturist12903767 - Justus von Liebig, German chemist, at work in his laboratory12903445 - Justus von Liebig, 19th century German chemist12903444 - Justus von Liebig, German chemist, 186612903443 - Justus von Liebig, German chemist, c186012902853 - Justus von Liebig (1803-1873), German chemist, 190012900338 - Liebig in His Laboratory-Chemistry, mid 19th century12627021 - Justus von Liebig, German Chemist11728305 - Jean-Baptiste Boussingault11700251 - Firman Bear,US soil scientist11653679 - George W. Carver,US agriculturalist