Bilingual Counting Card featuring illustrations of three Sponge Divers.
English Counting Card featuring illustrations of three Sponge Divers.
Spanish Counting Card featuring illustrations of three Sponge Divers.
Bilingual Counting Card featuring illustrations of three Starfishes.
"The stereoscope is an instrument for illustrating the phenomena of binocular vision, and for producing…
Illustration showing three triangles. This is used to show the following theorem: If two triangles have…