This chart shows the relationships among Senate leaders and officers who manage the flow of legislative and administrative business in the Senate.  

Congressional Sessions lists all Congresses and corresponding years  - from 1789, when the 1st Congress met, through the current Congress.

You can access legislative information, by bill number or key words, from the Congress.gov website.  Information from the present back to the 93rd Congress (1973) is available on Congress.gov.