Some useful links can be found below:

X-ray interactions with matter	CXRO websiteLink opens in a new window
International Union of Crystallography	www.iucr.orgLink opens in a new window
Periodic Table of the Elements	www.webelements.com/index.htmlLink opens in a new window
Online ESRF "SPEC" manual	One of many ESRF "SPEC" documentationLink opens in a new window
Certified Scientific Software	Official "SPEC" websiteLink opens in a new window
NPL Multiferroics wiki	Good starting point with Instrumentation and Good Practice guidesLink opens in a new window
Spectroscopy Database	Solid Spectroscopy Database infrastructure
ESRF Data Analysis Software	Scientific software list
Other synchrotron sources	Lightsources websiteLink opens in a new window