Hevea tapping results
Petch, T.
Hevea tapping results Experiment station, peradeniya,1914 - Ceylon 1915 - 1-16 p. - Experiment Ceylon Department of Agriculture. Bulletin No. 34 .
Hevea tapping results Experiment station, peradeniya,1914 - Ceylon 1915 - 1-16 p. - Experiment Ceylon Department of Agriculture. Bulletin No. 34 .