Benhart, J. .
Marginal lands.
София: , 2000, с. 235-246.
Benhart, J. (2000)
Marginal lands,
София: , с. 235-246
Benhart, J.
(2000).
Marginal lands. Environmental and Geographic Changes in Franklin County, Pennsylvania. Проблеми на географията. София: (1-4), с. 235-246.
