00533nam a22001697a 4500 BD-DhUL 20171226105158.0 161227s1973 enka|||| |||| 000 0 eng d BD-DhUL BD-DhUL 727 CHS Choudhury, N. K. D. Sound diffraction around movable partitions in teaching spaces / N. K. D. Choudhury Bangkok : UNESCO Regional Office for Education in Asia, 1973. 61p. : illus. ; 29 cm. Moving Pictures. ddc BK 142810 142810 0 0 ddc 0 727_000000000000000_CHS 0 NFIC 269245 DUL DUL GEN 2016-12-27 727 CHS A116488 2016-12-27 1 2016-12-27 BK