2 results containing "Conservation of natural resources--1910-1920."
Uncle Sam needs that extra shovelful
 | 1 print (poster) | Sindelar, F.
POS - US .S58, no. 1 (C size) [P&P] | LC-DIG-ds-07716 (digital file from original item)
Light consumes coal - Save light, save coal United States Fuel Administration /
 | 1 print (poster) | Phillips, Coles, 1880-1927
POS - US .P552, no. 1 (C size) [P&P] | LC-USZC4-1126 (color film copy transparency)