Temperature coefficient of resistance data?

Hi,

I found the table for the temperature coefficient of resistance (TCR)on this site:
http://www.allaboutcircuits.com/vol_1/chpt_12/6.html

Anybody know where this data comes from? I checked the CRC handbook of chem and Physics (60th Edition) and didn't find it there.
Specifically, I'm looking for the TCR for Pt and Ti. If I could also get the higher
order coefficients, that would be great.

Also, does anyone know how the resistance of a metal changes when alloyed with another metal? say evaporated Au, Pt and Ti?

thanks for any help.

Felix
felix.p.lu@boeing.com