TY - ADVS AU - Ashby,Maurice TI - Balance and change in nature PY - 1977/// CY - [S.l.], PB - Focal Point Audio Visual Ltd. KW - Ecological assessment (Biology) N1 - part 1; Woodland as a climax plant community -; part 2; Woodland - the complete ecosystem -; part 3. Origins of woodland - colonization to grassland -; part 4; Origins of woodland - scrub to climax forest ER -