Pencil Sketch of a Human Skull on Lined Paper
Botanical Illustration of Red Onion with Butterfly
Vintage Butterfly Study: Black and Grey Wing Specimens
Johann Sebastian Bach's Original Fugue Manuscript
Drawing of a Goat Skull with Measurements
Vintage Bat Illustration with Handwritten Notes
Vintage Butterfly Illustration with Scientific Diagrams
Botanical Study of Dark Purple Flowers and Foliage
Scientific Illustration of Chiton Mollusk Shells
Vintage Lepidoptera Scientific Butterfly Illustration Plate
Vintage Illustration of Bats and Spider on Old Paper
Vintage Anatomical Illustration of the Human Spine and Torso
Vintage Engraving of an Eye with Text and Arrow
Entomological Study: Insects and Anatomical Sketches
Champignons Mushroom Species Identification Chart
Anatomical Skull Study in Graphite Pencil
Historical Anatomical Engraving of Fish Liver Study