Where can I find a list of asset ?s (betas) to be used in a CAPM valuation model?

I am looking specifically for the following three industries: resort
hotels, gambling/gaming, and mass transit.

While I would prefer to be able to find these online, I could also
potentially find the info in a print source if anybody knows which
one.

As a clarification, I am not looking for the individual equity betas
for these industries.  I'm looking for the betas of the underlying
assets.

Thank you for your time!