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field and laboratory exercises in ecology:

By "wratten, stephen d. ". uk : edward arnold 1980 . "x, 227p.; 23 cm.". 0-7131-2725-2

By "wratten, stephen d. ". uk : edward arnold 1980 . "x, 227p.; 23 cm.". 0-7131-2725-2

By "wratten, stephen d. ". uk : edward arnold 1980 . "x, 227p.; 23 cm.". 0713127252

By "wratten, stephen d. ". uk : edward arnold 1980 . "x, 227p.; 23 cm.". 0713127252

By Edwards, Peter J.. London : E. Arnold, 1980 . 60 p. : 22 cm.. 0713128038 (pbk.) :