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3. Regulations for the sale, barter, or exchange of any virus, therapeutic serum, toxin, antitoxin or analogous product or arsphenamine or its derivatives (or any other trivalent organic arsenic compound) in the District of Columbia or in interstate traffic or in export or import traffic

nlm:nlmuid-101392636-bk

7. Letter from Aaron Klug to Francis Crick

nlm:nlmuid-101584582X213-doc

8. Letter from Francis Crick to Aaron Klug

nlm:nlmuid-101584582X214-doc