Some correspondence of Derek Thomas Whiteside Late correspondence of D T Whiteside: notably with the Prime Minister via the Department of Trade and Industry, and with the Post Office, in order to have a commemorative stamp or stamps marking the anniversary of the publication of Isaac Newton's 'Principia Mathematica'. Derek Thomas 'Tom' Whiteside FBA (1932-2008), British historian of mathematics and authority on Isaac Newton. Adolf Prag (1906-2004) mathematics master and Librarian at Westminster School. Proofreader and commentator on Whiteside's editions of Isaac Newton. 26 February 1982-5 April 1986