Document Retention
How long to keep tax documents
https://www.consumerreports.org/taxes/how-long-to-keep-tax-documents/
How long to keep records/IRS
https://www.irs.gov/businesses/small-businesses-self-employed/how-long-should-i-keep-records/
How Long Should I Keep Old Documents?
http://lifehacker.com/5994409/how-long-should-i-keep-old-documents
What to Keep and What to Get Rid of?