=LDR 00000nam a2200000ui 4500 =001 2981 =008 250530s1975\\\\xx\|||||||||||||||||eng\d =082 04$a519.5 UNW =100 1\$aUnwin, David =245 10$aAn introduction to trend surface analysis =260 \\$bCATMOG,$c1975 =852 \\$bFreeman Library$cPamphlets$h519.5 UNW