Publishing History

This is a chart to show the publishing history of editions of works about this subject. Along the X axis is time, and on the y axis is the count of editions published. Click here to skip the chart.  This graph charts editions published on this subject.
Editions Published
Year of Publication

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Prolific Authors

who have written the most books on this subject
Andre Norton, 2 books
David Petersen, 2 books
Sylvia Engdahl, 2 books
Philip Reeve, 1 book
James Gurley, 1 book
David Weber, 1 book
O. R. Savage, 1 book
Herbert W. Franke, 1 book
Isaac Asimov, 1 book
Valjeanne Jeffers, 1 book
Ingrid Moon, 1 book