Thermistor Steinhart-Hart coefficient ABC
You only have half the equation

That datasheet isn't intended to be read by itself (it's terribly unfortunate that the links in it are broken, too).  You'll want this document to go with it, as it's where the temperature curves for the various materials got put (don't ask me why).  The Steinhart-Hart coefficients are in the bottom two tables on the left side of the page for the D9.7A material your thermistor uses (page 69 in the linked PDF).