00323nam a2200109Ia 4500008004100000040003800041100002200079245002900101260004600130300001700176653002000193211228s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aHoinville, Gerald 0aSurvey research practice  bHeinemann educational booksaLondonc1978  axii, 228p p.  aScience surveys