02a0007265;¥62.00;20011205d1983 ekmy0engy01;eng;a z 000yy;r;FFTFIL: a filtering program based on twodimensional Fourier analysis of geophysical data;Thomas G. Hildenbrand;[S.l.];USGS;1983;60 p.;Open File Report;U.S. Geological Survey;83-237;2252;aOpen File Report ; fU.S. Geological Survey ; v83-237;a626.5 ; a630.72;Hildenbrand;Thomas G.;101;429264;626.5;H54;r¥62.00;a01;b1