The Legislative Services Agency publishes rules for all state agencies.  Permanent rules for the Department of Natural Resources are adopted by the Natural Resources Commission and compiled within 312 IAC . http://www.in.gov/legislative/iac/iac_title?iact=312  

Temporary or emergency rules are adopted by the DNR Director and published regularly in the IndianaRegister.   http://www.in.gov/legislative/register/irtoc.htm  LSA does not compile them, but the Commission provides an unofficial compilation of DNR's temporary or emergency rules .  http://www.in.gov/nrc/2386.htm