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Subtitle: [ismeretterjesztő képeskönyv]
By: Bolgár Györgyi ; [Csergezán Pál rajzaival].
Contributors: Csergezán, Pál.
Edition: 3. kiad.
Publisher: Móra
Published: 1977
Place of publication: Budapest
Language: hun
Number of pages: 26
Subjects: Bridges -- Juvenile literature.