[DirectX 3 Programmer's Reference] B (100%)

Glossary

[DirectX 5 Programmer's Reference] B (100%)

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[DirectX 8.1 Visual Basic Programmer's Reference] B (80.7692307692308%)

DirectX 8.1 (Visual Basic) > Glossary

[DirectX 8.1 C/C++ Programmer's Reference] B (77.7777777777778%)

DirectX 8.1 (C++) > Glossary

[DirectX 7 Programmer's Reference] B (71.4285714285714%)

Microsoft DirectX 7.0 > Glossary

[DirectX October 2006 Documentation] B (35.1851851851852%)

DirectX SDK > Introducing DirectX 9.0 > Namespaces > Microsoft.DirectX > Structures > Plane > Fields