00301nam a2200109Ia 4500082001900000100002700019245007000046260005200116300001300168500000500181700000500186  a333.95bK94.NE  aKrutilla, J. V. d ed.  aNatural environmentsbstudies in theoretical and applied analysis  aBaltimorebJohns Hopkins University Pressc1972  ax, 352p.  a  a