XBOX Nation is available from 11/01/2002 to present in MasterFILE Premier and Middle Search Plus.

Xenobiotica is available as follows: [from 01/01/1997 to 1 year ago in Academic Search Premier] [from 1997 to present in Electronic Collections Online].

Xenotransplantation (Kbenhaven) is available from 01/01/1999 to 1 year ago in Academic Search Premier.

Xenotransplantation (Københaven) is available from 1999 to present in Electronic Collections Online.

Xinhua (China) is available from 05/04/2000 to present in eLibrary.

xSP Advisor is available from 04/11/2001 to 10/02/2002 in MasterFILE Premier.