Infrared Absorption/Transmission Spectra of different types of glass?

csnsc14320

I was wondering if anyone would know where to look to find graphs of the absorption and/or transmission of the infrared spectrum of different types of glass (fused quartz, sapphire, BK7, etc.) as a function of wavelength (between 3 microns to 300 microns or in that range).

I've looked in my University's library and isiknowledge.com to no avail so far.

Any ideas?