by Levi L. Conant
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Original exercises in plane and solid ge...
Plane and spherical trigonometry
Five-place logarithmic and trigonometric...
Plane trigonometry
Primitive number systems / by Levi L. C...
The number concept
Enneads
RepreĢsentation du monde chez l'enfant
Ten, nine, eight
One Fish, Two Fish, Red Fish, Blue Fish
Balloon
Innumeracy