Natural resources - United States.

[NT 60487] Overview

[NT 60478] Works:	2 [NT 60520] works in 2 [NT 60521] publications in 1 [NT 60522] languages

[NT 60480] Titles

Earth resources [NT 59711] by: Park, Charles F. ([NT 1579] Language materials, printed)

The economics of natural environments : studies in the valuation of commodity and amenity resources [NT 59711] by: Fisher, Anthony C.; Krutilla, John V. ([NT 1579] Language materials, printed)