Conserving natural resources : principles and practice in a democracy

[by] Shirley Walter Allen [and] Justin Wilkinson Leonard
Bok · Engelsk · 1966

Utgitt	New York : McGraw-Hill , [1966]
Omfang	VII, 432 s. : ill.
Utgave	3d ed.
Emner	Conservation of natural resources - United States naturressurser bevaring vern