United States Eventing Association, Inc.
The 2017 USEF Rules for Eventing is available for pre-order only. It will be mailed late March/early April.
If you need to see the rules immediately, you can download a version here.
Basics of Show Jumping Course Design
ICP Standards Booklet (Included in the ICP registration fee)
ICP Workbook (Included in the ICP registration fee)
Life in the Galloping Lane