Internet links to Iowa government agencies, statutes, regulations, cases, etc. are posted by FindLaw and WashLaw. Primary legal materials are also available from Lexis and Westlaw. Google Scholar has free cases back to 1950. Subscription services Versuslaw and Fastcase have cases back to 1950 as well. Supreme and appellate court cases are published in the North Western Reporter.
Information about bills introduced in the current and previous sessions is available through the Iowa Legislature website. For legislative intent research, the Archives page has an impressive collection of bills, session laws, reports, journals, committee information and superseded state statutes going back in some cases to 1995. For questions, call the Legislative Information Office (515-281-3566 or -8817) and/or the Legislative Library (515-281-3312).
The Legislature's Statutory Law page links to historical editions of the Iowa Code back to 1839. The Legislature also posts the current Iowa Administrative Code, as well as historical editions back to 1998. The State Law Library posts the Governor's Executive Orders.
For a discussion of Iowa law, see the Iowa Practice Series (West).
For an introduction to Iowa legal research resources see Iowa Legal Research: Sources of Iowa Law and Iowa Legislative Information by the Drake University Law Library. For a more extensive discussion, see Iowa Legal Research (Carolina Academic Press, 2011) and/or the Iowa Legal Research Guide by John D. Edwards (W.S. Hein & Co., 2003).
For questions about Iowa legal materials, copies and/or inter-library loan, try calling the Iowa State Law Library (800-248-4483), the University of Iowa Law Library (319-335-9002), and/or the Drake University Law Library (515-271-3189).