When-- questions to 50 interesting answers
By: Bal Phondke ; illustrations, Subhash Roy.
Edition: 1st ed.
Series: Popular science
Publisher: National Book Trust
Published: 2009
Place of publication: New Delhi
Language: eng
Number of pages: 245
ISBN-13: 9788123755472
Other titles: When-- questions to fifty interesting answers
Notes: Title appears on background as "?"

Includes bibliographical references (p. [233]-245).