00397nam a2200121   4500020001000000082001700010100001800027245002800045260004900073300003600122500002600158650009100184  a(pbk)  a301.21	bHAU  aHaugen, Einar  aThe ecology of language  aCalifornia bStanford university pressc1972  axiv, 366 p. b: ill. c; 23 cm.  aInclude bibliography.  aThe ecology of languagevLanguage planning vDialect vImmigrationvBilingualismvFBSH