Letters between the Association of Austrian Engineers and J B S Haldane Letter from E Broda of the Association of Austrian Engineers inviting Haldane to sponsor a meeting of the Association and copy of Haldane's response, both July 1945. Letter dated April 1946 from the Association of Austrian Engineers asking Haldane to sign a letter of appeal, annotated by Haldane to indicate that he signed and returned the appeal. Jul 1945