“Columbine ~ Ancoli, ~ die Aglei.” Plate 12. Page 12. Anna Martin, artist. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing partner. In the public domain due to age. via https://archive.org/details/planteetsesappl00Gras/page/12/mode/2up
“Courd ~ Courge ~ der Kürbisse.” Plate 13. Page 30. Maurice Pillard Verneuil, artist. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing partner. In the public domain due to age. via https://archive.org/details/planteetsesappl00Gras/page/n29/mode/2up
“Courd ~ Courge ~ der Kürbisse.” Plate 14, page 32. Maurice Pillard Verneuil, artist. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing partner. In the public domain due to age. via https://archive.org/details/planteetsesappl00Gras/page/n31/mode/2up
“Courd ~ Courge ~ der Kürbisse.” Plate 15, page 34. C. G. Schlum, artist. Collections of the Smithsonian Libraries. Biodiversity Heritage Library, digitalizing partner. In the public domain due to age. via
“Élévation de l’école de botanique de Palerme, exécutée à MDCCXC par L. Dufourny Arch.” Page 77. Collections of and digitalized by the Getty Research Institute. In the public domain due to age. via https://archive.org/details/gri_33125010714646/page/n77/mode/2up
“Porte principale de la cathédrale de messine.” Page 82. Collections of and digitalized by the Getty Research Institute. In the public domain due to age. viahttps://archive.org/details/gri_33125010714646/page/n82/mode/2up