00373nam a2200133 a 450000500170000002000150001708200220003210000160005424500340007026000510010430000210015549000360017670000270021220251203091840.0  a0801818184  a658.1552,bD, Squ  aSquire, Lyn  aEconomic analysis of projects  aBaltimorebJohn Hopkins University pressc1975  axi,153p.c23 cm.  aWorld bank research publication  aVan Der Tak, Herman G.