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	1.	No cover image available American agriculture, 1899-1939 a study of output, employment and productivity by Barger, Harold and Landsberg, H. H Landsberg, H. H. ; jt. auth Material type: Text Publication details: New York NBER 1942 Availability: Items available for loan: ISID (1)Call number: 338.10973 B251.AA. Place hold
	2.	No cover image available Transportation industries 1889-1946; a study of output employment and productivity by Barger, Harold Material type: Text Publication details: New York NBER 1951 Availability: Items available for loan: ISID (1)Call number: 338.6042 B251.TI. Place hold
	3.	No cover image available Mining industries, 1899, 1939; a study of output employment and productivity by Barger, Harold and Schurr, S. H Schurr, S. H. ; jt. auth Material type: Text Publication details: New York NBER 1944 Availability: Items available for loan: ISID (1)Call number: 338.20973 B251.MI. Place hold

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