Heva tapping results, experiment station, peradeniya, 1911-1913
Petch, T.
Heva tapping results, experiment station, peradeniya, 1911-1913 - Ceylon 1914 - 1-28 p. - Experiment Ceylon Department of Agriculture. Bulletin No. 12 .
Heva tapping results, experiment station, peradeniya, 1911-1913 - Ceylon 1914 - 1-28 p. - Experiment Ceylon Department of Agriculture. Bulletin No. 12 .