National Research Council, Transactions of the American Geophysical Union
1969 ◽
Vol 54
(1)
◽
pp. 181-182
1935 ◽
Vol 61
(259)
◽
pp. 221-221
1969 ◽
Vol 54
(5)
◽
pp. 799-799
1966 ◽
Vol 51
(1)
◽
pp. 207-208