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Fir Wood Planks is a block added by ExtrabiomesXL. It is crafted the say way as any vanilla planks, by putting raw wood in any crafting grid. It outputs the normal four planks to on raw wood. The fir wood tree is very tall, and with many leaves, but is lacking in a wide trunk or branches, making it more effecting than oak for a tree farm, but not as effective as other trees added by different mods.