00516nam a22001937ar4500 161 20260807120459.0 930909s1982 ag 000 0 spa d clsautm spa Argentina 574.5 A543 1982 Ander-Egg, Ezequiel, 1930-2024 111 El desafío ecológico / Ezequiel Ander-Egg. Buenos Aires : Humanitas, 1982. 150 p. : il. Guidanee ; 16 10646 ECOLOGIA 10647 161 161 0 0 0 0 BDGA BCC BCC 1998-11-01 0 574.5 A543 1982 UTEML50000487 2024-03-08 21:30:44 c. 1 2024-03-08 LIB 0 0 0 0 BDGA BCC BCC 1998-11-01 0 574.5 A543 1982 UTEML50000488 2024-03-08 21:30:44 c. 2 2024-03-08 LIB