Guma
Izgled
Guma ili elastična guma je mehanički čvrst i izvanredno elastičan materijal koji se dobija od kaučuka postupkom vulkanizacije.
- International Rubber Research & Development Board Arhivirano 2006-01-16 na Wayback Machine-u
- History of the International Rubber Industry from 1870-1930 from EH.NET Arhivirano 2007-09-27 na Wayback Machine-u
- Rubber Board Of India Arhivirano 2007-09-27 na Wayback Machine-u
- Rubber Division of ACS Arhivirano 2019-05-01 na Wayback Machine-u
- Rubber timeline
- Stop Firestone's Use of Child Labor in Rubber Production