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2.
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A master of sound by Levine, Israel E. Series: Ladder : 3000 words ; L-6Material type:  Text; Format:
print
Language: English Publication details: New York : Pyramid, 1966Availability: Items available for loan: Biblioteca Central UNNECall number: 621.3 L665 ej.1 (1).
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3.
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Tiros : weather eye in space by Jakes, John, 1932. Series: Ladder : 3000 words ; L-83Material type: Text; Format:
print
Language: English Publication details: New York : MacFadden, 1969Availability: Items available for loan: Biblioteca Central UNNECall number: 629.19 J25 ej.1 (1).
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4.
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Scientists who work with astronauts by Poole, Lynn | Poole, Gray. Series: Ladder : 3000 words ; L-38Material type: Text; Format:
print
Language: English Publication details: New York : Popular Library, 1967Availability: Items available for loan: Biblioteca Central UNNECall number: 629.19 P822 ej.1 (1).
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5.
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An unwilling traveler in Russia by Wittlin, Tadeusz. Series: Ladder : 3000 wordsMaterial type: Text; Format:
print
Language: English Publication details: New York : New American Library, 1966Availability: Items available for loan: Biblioteca Central UNNECall number: 82(73)-3 W822 ej.1 (1).
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6.
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