The AAVSO Organization Collection ECP—Edward C. Pickering Era—1877-1911 WTO—William Tyler Olcott Era—1911-1915 LC—Leon Campbell Era—1915-1949—documents in ECP, WTO, organiz. LC—Leon Campbell Era—1915-1949 MWM—Margaret W. Mayall Era—1949-1973 JAM—Janet A. Mattei Era—1973-2004 Main page Introduction Historical background Description Finding aids Tags images history documents archives
