Explanation:

 In the lower hills of Himachal Pradesh  Acacia catechu (Khair) for katha, Pinus roxburghii (chirpine) for resin. Acacia nilotica (Kikar) for tannin and gums and Grewia optiva (Beul) for fodder and fibre are well known. The villagers manage and protect these trees/wood lots and obtain high economic returns.