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Voici les éléments 41-50 de 49

551 + 622 : 001 (82) (047) (1)
553.56 (822.3) (047) (1)
553.611 (825.2) (047) (1)
556.3 (61) (82) ¨1966¨ (1)
556.3 (61) (82) ¨1967¨ (1)
556.3 (61) (82) ¨1969¨ (1)
622 : 55 (047) ¨1955¨ (1)
agua subterránea (1)
Amancay, mina (Calingasta, San Juan, Argentina) (1)
arcilla (1)