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Show PLEDGE CARDS FOR COAL ARE COMING By Associated Press. CHICAGO. ct. J.&. A national campaign cam-paign of education regarding th conservation con-servation of coal, to be followed by a system of pledge cards. In to be Instituted Insti-tuted under governmental supervision, according to steakera at a conference of manufacturers from Illinois and Wisconsin. Wis-consin. That great danger of a coal shortage In imminent unlena a war aavlng method be adopted In conserving coal was a note of warning by W. Chamlerlain I Robinson, director of th bureau of oil conservation, and 'Sborn Monnett. assistant as-sistant advisory engineer, both of Wanh-ington. |