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/usr/share/doc-base/survex-manual is in survex 1.2.26-1.

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Document: survex-manual
Title: Survex Manual
Author: Wookey and Olly Betts 
Abstract: This manual describes what Survex is and how it can be used to
 process cave survey data.
Section: Science/Geoscience

Format: PDF
Files: /usr/share/doc/survex/manual.pdf*

Format: Text
Files: /usr/share/doc/survex/manual.txt.gz

Format: HTML
Index: /usr/share/doc/survex/manual/index.htm
Files: /usr/share/doc/survex/manual/*.htm