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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 20 | next 20) (20 | 50 | 100 | 250 | 500)- Iron Axe (1 member)
- Iron Hoe (1 member)
- Iron III Chloride (1 member)
- Iron III Oxide (1 member)
- Iron Pickaxe (1 member)
- Iron Pogo Stick (1 member)
- Iron Shovel (1 member)
- Iron Sword (1 member)
- IsoButane (3 members)
- IsoPentane (3 members)
- Isobutylene-Isoprene Rubber (3 members)
- Isobutylene Rubber (7 members)
- Isopherone Diisocyanate (3 members)
- Isophthalic Acid (3 members)
- Isophthaloyl Chloride (3 members)
- Isophthaloyl chloride (3 members)
- Isoprene (3 members)
- Isopropanol (3 members)
- Kerosene (3 members)
- Krypton (3 members)