Verma, V. P. S., P. S. Payal, and S. P. Pant. 1976. “Search for Non Corrosive Chemicals for Increasing Resin Yield from Chirpine (<I>Pinus roxburghii< I> Sargent)”. Indian Forester 102 (6):408-13. https://doi.org/10.36808/if/1976/v102i6/11913.