Bilaketaren emaitzak - "Time study."
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41
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42
Motion and time study an introduction to methods, time study and wage payment
Argitaratua 1958Liburua -
43
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44
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45
Motion and time study; an introduction to methods, time study, and wage payment.
Argitaratua 1962Liburua -
46
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47
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48
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49
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50


