The following link will take you to a document detailing the Nebraska Game and Parks Association wildlife regulations in their entirety.
This is an exhausting and detailed list of all the regulations pertaining to wildlife, including trapping and hunting, for the state of Nebraska.
Whereas the annual Hunting Guides will summarize this info (and make it easier for us non-lawyer types for us to read), this is the source from which the guides are produced.
Here is the link: Nebraska Wildlife Regulations
This information is also available as a link under the Education menu.
Thank you to Dave Hastings for pinpointing this information for us.