[texhax] typesetting, and "subtitle"

[bcr2925 at fsu.edu]

Hello, smart TeXers.  I have a two part question, one for LaTeX, and another more generally for typsetting.

What's the technical term for the second title -- the bit occupied by "or, how I learned to stop worrying and love the bomb"?  I thought of second title, subtitle, epigram, none of them are quite it.  Other example (from the two books closest by me):

New Spirits -- American from 1865 - 1905

and 

The gilded Age -- a history in documents.

I'm interested in the second bit.

Second question.  How do I represent that part of the title in LaTeX?  I tried \subtitle but of course that didn't work.  Should I just consider it a part of the title?  like:

\title{New Spirits \\
America from 1865 - 1905}

That doesn't give me quite the effect I'm looking for.

FYI, I'm using amsbook, but I'd think a solution from book or memoir would suffice, too.

Thank you,

Robert