Philadelphia: University of Pennsylvania Press / Wharton School, 1949. First Edition. Octavo. Staple-bound pamphlet; printed card wrappers; 60pp. Private library catalog label on front cover, else clean, tight and unmarked; Very Good or better. A volume in the "Industry-Wide Collective Bargaining Series," issued under the auspices of the Labor Relations Council of the Wharton School of Finance.