Policy Memo 24 - NPS Contract Usage Guidelines - 2007Issued on May 2, 2007. (Superseded on July 7, 2013).https://www.codot.gov/business/designsupport/policy-memos/archived-policy-memos/policy-memo-24-5-2-07.pdfhttps://www.codot.gov/@@site-logo/siteLogo.png