1. [Letter : W[illia]m Petty to Samuel Hartlib] Creator: Petty, William, Sir, 1623-1687 Published / Created: Undated Call Number: OSB MSS FILE 16795 Collection Title: Osborn Manuscript Files Container / Volume: Folder 16795 Image Count: 2 Resource Type: Archives or Manuscripts Found in: Beinecke Rare Book and Manuscript Library > [Letter : W[illia]m Petty to Samuel Hartlib]