Verma, V. P. S. and Pant, S. P. (1978) “Performance of Slash Pine (<I>Pinus elliottii</I> Engelm.) Vis-a-vis Chirpine (<I>Pinus roxburghii</I> Sargent) in Respect of Oleoresin Yield at Dehra Dun”, Indian Forester, 104(11), pp. 768–771. doi: 10.36808/if/1978/v104i11/11586.