The Wisconsin Legislative Reference Bureau maintains a nice subject index to Wisconsin Governor’s executive orders.
The index, which was recently updated, includes executive orders from Govs. Knowles, Lucey, Dreyfus, Earl, Thompson, McCallum, Doyle, Walker, Acting Gov. Schreiber, Lt. Govs. Olson and Flynn, and Secretary of State Zimmerman.
The dates of issue span from January 1965 to December 2012.
Each index entry includes a brief summary of the order, the issuing governor and date.
If you are interested in locating a copy, executive orders from 1965 forward can be found online at https://docs.legis.wisconsin.gov/code/executive_orders.