Older Documentation
We recommend the GTK+ 2.x libraries and documentation instead because GTK+ 1.2 is no longer supported, this documentation is available for those that need it.
Books
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GTK+/Gnome Application Development
This book was written by Havoc Pennington -
GTK+ Programming in C
This book was written by Syd Logan -
Developing Linux Applications with GTK+ and GDK
This book was written by Eric Harlow -
Sams Teach Yourself GTK+ Programming in 21 Days
This book was written by Donna Martin -
GNOME/GTK+ Programming Bible
This book was written by Arthur Griffith
Tutorials
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GTK+ 1.2
Official Tutorial