Here you go. Click on the first two non-advertisement links there.
Alternately, there's more good info at http://iowafc.org/permits/
The executive summary is:
- do not carry in a school or school grounds, prison, federal building, casino, nor state capitol. Ignore signs everywhere else, they don't matter.
- don't carry while intoxicated
- no duty to notify
- no duty to conceal
- duty to retreat when it will not increase the risk to self/other