Contains mods:
BC Transport (buildcrafttransport) - 7.99.20-pre1
BuildCraft Lib (buildcraftlib) - 7.99.20-pre1
BC Builders (buildcraftbuilders) - 7.99.20-pre1
BC Silicon (buildcraftsilicon) - 7.99.20-pre1
BuildCraft (buildcraftcore) - 7.99.20-pre1
BC Robotics (buildcraftrobotics) - 7.99.20-pre1
BC Energy (buildcraftenergy) - 7.99.20-pre1
BC Factory (buildcraftfactory) - 7.99.20-pre1