Testimony Of  Dr. Walter G. Copan, Under Secretary Of Commerce For Standards And Technology Director, National Institute Of Standards And Technology (Nist), United States Department Of Commerce, Before The United States House Of Representatives Committee On Science, Space, And Technology Subcommittee On Research And Technology Regarding A Review Of The National Institute Of Standards And Technology Fiscal Year 2020 Budget Request. April 9, 2019. Unclassified.