There is e.g. [Writing A Useful Program With NASM ][1] and of course the obvious [
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][2].
There are a couple of sample programs at [
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][3]
If you are looking for a more general introduction to assembly programming there is [The Art of Assembly Programming][4] and the wikipedia page on NASM references [Assembly Language Step by Step][5] by Jeff Duntemann.
[1]:
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[2]:
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[3]:
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[4]:
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[5]:
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