"PARKWAY PLASTICS, INC."

Gray with line crinoid columnal fragments.

Lens holder for 50 mm lenses or mirrors for use with Eisco Optical Bench.

Learn To Use And Create Dichotomous Keys.

Bigger design for easy connections.

This set is economical, durable, and versatile.

Vividly demonstrate the power of magnetic attraction.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

Light gray, earthy.

Chlorite-mica with perfect slaty cleavage.

The durable Wilmshurst Machine is made for years of use.

Demonstrate Characteristics of Primary and Secondary Cells

Reliable kit in a quality carrying case!

Light gray, with flow structure.

Introduce coding and programming in a fun an easy way.

Amphibole group; black, coarse, massive.

Buff-colored, coarse, detrital limestone, with cemented shell fragments.