<p>So I'm taking Chem20A,
and these are the books that are "required"</p>
<p>Oxtoby (9780495481041)
Pkg: Princ Mod Chem (6th) W/custom Ssm
&
Oxtoby (9780534493660)
Princ Mod Chem (6th)</p>
<p>What's the difference between the two?</p>
<p>“w/ssm” means “with (student) solutions manual”. the one isn’t the package does not include the solutions manual.</p>
<p>I bought the regular book from Amazon and then separately bought the normal SSM. I’m assuming the custom SSM is optional since you can opt to buy the package with no SSM at all so the standard SSM should be good enough to help me out right?</p>