SEC Filings

Filing date	Form	Description	View
Feb 15, 2012	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-12-000026.pdf 0000066756-12-000026.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 16, 2011	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-11-000029.pdf 0000066756-11-000029.xls EX-101.CAL - XBRL TAXONOMY EXTENSION CALCULATION LINKBASE
Feb 15, 2013	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-13-000030.pdf 0000066756-13-000030.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 14, 2014	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-14-000026.pdf 0000066756-14-000026.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 17, 2015	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-15-000022.pdf 0000066756-15-000022.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 22, 2016	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-16-000169.pdf 0000066756-16-000169.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 15, 2017	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-17-000035.pdf 0000066756-17-000035.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 15, 2018	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-18-000029.pdf 0000066756-18-000029.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 14, 2019	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-19-000023.pdf 0000066756-19-000023.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Feb 13, 2020	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000066756-20-000016.pdf 0000066756-20-000016.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT