000 00326pam a2200121a 44500
008 160408b1958 xxu||||| |||| 00| 0 eng d
082 _a625.7
_bN214B NO.37
100 _aNational Research Councol
245 1 _aSPECIAL REPORT
260 _aWashington
_bNational Research Council
_c1958
964 _gCIRC
997 _aA84153 W
999 _c284170
_d284170