1. [Letter : W[illia]m Petty, 1652 May 17 to Samuel Hartlib] Creator: Petty, William, Sir, 1623-1687 Published / Created: 1652 May 17 Call Number: OSB MSS FILE 16798 Collection Title: Osborn Manuscript Files Container / Volume: Folder 16798 Image Count: 2 Resource Type: Archives or Manuscripts Found in: Beinecke Rare Book and Manuscript Library > [Letter : W[illia]m Petty, 1652 May 17 to Samuel Hartlib]