The economics of soil erosion in the Philippines by Intia, Hermes M.

The last days of mankind ecological survival or extinction by Mines, Samuel

Perspectives on resource management by O'Riordan, Timothy

The everglades today endangered wilderness by Sand, George X., 1915-

Decade of decision report on the Conservation Society's conference 'Conservation 1970s'

Natural resource conservation an ecological approach by Owen, Oliver S. 1920-

Table of contents only

Pollution the land we live on by Jones, Claire

Elementary soil and water engineering

Nature study for conservation a handbook for environmental education by Brainerd, John W. 1918-

Table of contents only

Soil conservation. by Hudson, Norman