Libra
The incense of Libra is galbanum, a resin derived from Ferula gummosa / galbaniflua and Ferula rubricaulis, which grow mostly in Iran. This makes it very hard to get.
Fortunately, the plants and flowers of Libra are easy to get, and have lovely scents, so instead of galbanum, you can use fragrances of pine, cypress, and narcissus.
