The documentation set consists of the CDF User Guide, the CDF C Reference Manual, the CDF Fortran Reference Manual, and the CDF Internal Format Description.
The CDF documents are available in Adobe PDF files, and they are located at spdf.gsfc.nasa.gov/pub/software/cdf/doc/latest_version.
The latest CDF release is Version V3.9.1 and its documentation consists of:
CDF V3.9.1
CDF User Guide in PDF
CDF C Reference Manual in PDF
CDF FORTRAN Reference Manual in PDF
CDF Perl Reference Manual in PDF
CDF C# Reference Manual in PDF
CDF JNI-based Java APIs in PDF
CDF JNI-based Java APIs in HTML
Condensed Original/New/Modified IDL® routines help text in text
Condensed Original/New/Modified MATLAB®-CDF routines help text in text