How do I get PDF files to my Iphone 4G?

New Iphone 4G owner here and a bit confused.

I have protocols for my job ( EMT on ambulance ) that I would like to put on my Iphone 4G so I can access them without carrying my protocol book around in my pocket.

The file is an Adobe Acrobat file 20.1mb and I would love to get it on there somehow.

Any ideas?
 
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