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/usr/share/doc-base/therionbook is in therion-doc 5.4.1ds1-2.

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The actual contents of the file can be viewed below.

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Document: therionbook
Title: Therion Manual
Author: Martin Budaj and Stacho Mudrak
Abstract: This manual - the 'Therion Book' is a 
 comprehensive guide to the therion application,
 commands and data formats.
Section: Science/Geoscience

Format: pdf
Files: /usr/share/doc/therion-doc/thbook.pdf