An eolaı́ocht ón tús leabhar an Dalta
Hampson, B. L.(Brian Lloyd),1921-
Evans, K. C.(Kenneth Cedric),1914-
O Geallabhain, M.
Firtear, Padraig.
Baile Atha Cliath Oifig an tSolathair,
1983
Originally published as: Science from the beginning 4, 1966, 1977
Science