(1989). The Fragile environment: The Darwin College lectures / edited by Laurie Friday and Ronald Laskey.
Chicago-čujuhus (17. p.)The Fragile Environment: The Darwin College Lectures / Edited by Laurie Friday and Ronald Laskey. 1989.
MLA-čujuhus (9. p.)The Fragile Environment: The Darwin College Lectures / Edited by Laurie Friday and Ronald Laskey. 1989.
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