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RubyGemMod

Bored Of The Minecraft Items Dont Worry Use This Mod To Get Ruby Minecraft 1.7.2 Updated Bug Fixed Planning For The Next Mod!

RubyandSapphires

Adds 2 new gems

Rubymods

Dark, Ruby, Action!

Rubyseee

This is an example mod

Rucksacks by RenEvo

Adds colored ruck sacks and an ender ruck sack.

Ruins Spawning System by AtomicStryker, d00dv4d3r, kolt666, 4HeadTiger, Blue001

Allows highly customizable Structure Templates to randomly generate in your Worlds

worldgen dungeons

RuinsAndConstrucs

A reason to explore the world1

RuinsAndConstructs

Spices up your world with new structures!

Rule The World by Tichi

Create your village, build your army, and rule the world!

RuneCraft by pahimar

Transmute stuff into other stuff! Become a Minecraft God!

RuneTune by Jagex, Vazkii

Runescape music in minecraft!

Runeandisaacitem

This is an example mod

Runecarved by warlordjones, SkySom, DivineAspect

Curious is the trapmaker's art, his efficacy unwitnessed by his own eyes