Iowa Code § 456.4: Investigations — collection.

The state geologist shall investigate the characters of the various soils and their capacities for agricultural purposes, the streams, and other scientific and natural resource matters that may be of practical importance and interest. A complete cabinet collection shall be made to illustrate the natural products of the state, and the state geologist may also furnish suites of materials, rocks, and fossils for colleges and public museums within the state, if it can be done without impairing the general state collection.