Singh, R.V. and Chandel, P.C. 1971. Sustained Resin Yield from <I>Pinus roxburghii</I> (chir) Forests of Himachal Pradesh. Indian Forester. 97, 9 (Sep. 1971), 526–536. DOI:https://doi.org/10.36808/if/1971/v97i9/26454.