You will need to obtain copies of your documents from Social Security and from the financial institutions that issue your 1099's.
GET SSA1099
https://www.ssa.gov/faqs/en/questions/KA-01723.html
If your pension comes from the city or county, then contact them to find out how to get copies. You can likely go to their website to get copies. What about any other 1099's like from a 401k or IRA----did you have those?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**