Subject
- Toxaphene5
- Plastics--Testing4
- Polymers4
- African American men3
- Assembly-line methods3
- Plastics industry and trade3
- Port, Emily3
- Puppet theater3
- Quarries and quarrying3
- Terpenes3
- Textile chemical industry3
- Valves3
- Viscosity3
- Warren, Bertha3
- Wells, Mildred3
- 4-H clubs2
- Beckman Instruments, Inc.2
- Control boards (Electrical engineering)2
- DDT (Insecticide)2
- Entomology2