Financial Information Form 10-K Filing date View Feb 06, 2020 View HTML 0000101829-20-000013.pdf 0000101829-20-000013.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT Feb 07, 2019 View HTML 0000101829-19-000007.pdf 0000101829-19-000007.xls EX-101.INS - XBRL INSTANCE DOCUMENT Form 10-Q Filing date View Oct 25, 2019 View HTML 0000101829-19-000047.pdf 0000101829-19-000047.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT Jul 26, 2019 View HTML 0000101829-19-000038.pdf 0000101829-19-000038.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
