Url https://edisondigital.rutgers.edu/document/CJ621AAR Resource class dctype:Text Title [CJ621AAR], Letter from William Horatio Mason to Thomas Alva Edison, May 3rd, 1912 Creator Mason, William Horatio Subject Testing and quality control Cement Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1912-05-03 Type Letter Identifier CJ621AAR Source 204:395 Rights Thomas Edison National Historical Park Date Created 1912-05-03 Has Version https://archive.org/details/edisonmicrofilm204/page/n404/mode/1up Archive.org Viewer, Microfilm Series Reel 204 Is Part Of CJ621-F Recipient Edison, Thomas Alva Uri https://edisondigital.rutgers.edu/document/CJ621AAR https://edisondigital.rutgers.edu/document/CJ621AAR --