by COSPAR. Plenary Meeting , W. Riedler
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Study of land transformation processes f...
Scientific ballooning - IV
Solar-terrestrial energy program
The atmosphere of Venus
Remote sensing and mineral exploration -...
The heliosphere during the declining sol...
Le Tour du Monde en Quatre-Vingts Jours
Tom Sawyer Abroad
Life on the Mississippi
Cinq semaines en ballon
L'Île mystérieuse
The twenty-one balloons