/usr/share/doc-base/box2d is in libbox2d-doc 2.3.0+ds-2.
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Title: Box2D API documentation
Author: Erin Catto
Abstract: Box2D API documentation and manual
Section: Programming/C++
Format: HTML
Index: /usr/share/doc/libbox2d-doc/html/index.html
Files: /usr/share/doc/libbox2d-doc/html/*.html
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