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
Graham Hancock, 11 books
Edgar Rice Burroughs, 9 books
James Harpur, 4 books
Graham Hancock, 3 books
Molly Cochran, 3 books
Rand Flem-Ath, 3 books
Aleksandr Mikhaĭlovich Kondratov, 3 books
Jennifer Westwood, 3 books
David Hatcher Childress, 2 books
W. Raymond Drake, 2 books
Rob Shone, 2 books
Lara Bergen, 2 books
Lincoln Child, 2 books
Austen Atkinson, 2 books
Ruth Shick Montgomery, 2 books
Frank Joseph, 2 books
Robert M. Schoch, 2 books
Serge Hutin, 2 books
Ted Nield, 2 books
Jerome Clark, 2 books
Peter Kolosimo, 2 books
Stephen Hunt, 2 books
Bob Curran, 2 books
Paul Dunbavin, 2 books
Anne Moore Odell, 2 books