Url https://edisondigital.rutgers.edu/document/CJ615AEJ Resource class dctype:Text Title [CJ615AEJ], Letter from William Horatio Mason to Thomas Alva Edison, August 22nd, 1907 Creator Mason, William Horatio Subject Labor Health and safety Cement Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1907-08-22 Type Letter Identifier CJ615AEJ Source 203:359 Rights Thomas Edison National Historical Park Date Created 1907-08-22 Has Version https://archive.org/details/edisonmicrofilm203/page/n369/mode/1up Archive.org Viewer, Microfilm Series Reel 203 Is Part Of CJ615-F Recipient Edison, Thomas Alva Uri https://edisondigital.rutgers.edu/document/CJ615AEJ https://edisondigital.rutgers.edu/document/CJ615AEJ --