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r23>.5 B-665 Bock Betty and Farkas Jack Concentration and productivity.So me preliminary problems and findings. By Betty Bock and Jack Farkas. N.Y. National Industrial Conference Board, 1969. vi, 170 p.
("822 B-665 Booking Richard C. Canada’s water: for slae? Toronto James Lewis & Samuel, 1972. xii, 179 P. S2-Z-