"Weight Juvenile literature." . . . . . . . . . . . . . . "Juvenile works" . "Juvenile works"@en . . "Weight and weightlessness"@en . . . "Weight and weightlessness" . . . . . . . "Explains simply some basic principles involved in space flight." . "Weight and Weightlessness. (La Pesanteur et l'apesanteur)" . "Explains simply some basic principles involved in space flight."@en . .