The "Top 3" starting points for any chemical data search are all listed on the Chemistry Library's home page:
To get the most from this tutorial, open a separate browser window, bring up the Chemistry Library page, and connect to each tool in question so you can try it out for yourself as you go along. The CRC Handbook and DIPPR are licensed and restricted to UT-Austin students and faculty/staff. The NIST WebBook is open to all.
If you have more questions: