[OS X TeX] Documentation on documentclass{letter}

[Google Kreme]

I've yet to find a good (that is, complete) readme/help/tutorial that
explains the various options in \documentclass{letter} and how this
class differs from article, book, etc.

Anyone wanna tell me where to go?

Wait, let me rephrase.  Anyone wanna point me to such a readme?

extensive examples preferred.  I learn through plagiary. :)

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