00309nam a2200109Ia 4500082001900000100002000019245009100039260004600130300001300176500000500189700000500194  a339.3bD131.NI  aDahlberg, A. O.  aNational income visualized; a graphic portrayal of how economic activity is measuredb  aNew YorkbColumbia University Pressc1956  ax, 117p.  a  a