121021 OR Armstrong.pdf

I apologize, but the file "121021 OR Armstrong.pdf" that you mentioned was not actually provided in the text. While I see details about a Nebraska state contract opportunity for rock and aggregate materials, the specific file contents are not present. Without the actual file contents, I cannot summarize its specific details. The state contract opportunity indicates it is for various types of crusher run rock and surfacing aggregate materials, but I would need the referenced file to provide a comprehensive summary of its contents.