The earth : its shape, size, weight and spin /
Poynting, J. H.
The earth : its shape, size, weight and spin / J. H. Poynting. - Cambridge : University Press, 1913. - 141p. : il. ; 16 cm.
The earth : its shape, size, weight and spin / J. H. Poynting. - Cambridge : University Press, 1913. - 141p. : il. ; 16 cm.
