I have been here since 1976. I lost my green card and my social security card. I can't get one w/o the other. I have already tried. I know my ss # but not my green card #. How can I get this issue resolved?

You don't need your SSN to file the I-90. If you need information, such as you're a number, file a FOIA on form G-639, no filing fee. They will likely give you the file on a CD. Good luck.