An enrolled bill is the final official copy of the bill or joint resolution which both the House and the Senate have passed in identical form. After it is certified by the chief officer of the house in which it originated (the Clerk of the House or the Secretary of the Senate), and then signed by the House Speaker and the Senate President Pro Tempore, the measure is sent to the President for signature.
An engrossed bill is the official copy of the bill or joint resolution as passed by one chamber, including the text as amended by floor action, and certified before it is sent to the other chamber.
For more information, see About Congressional Bills on the GovInfo website, and the LLSDC guide Sources for the Text of Congressional Bills and Resolutions, compiled by Rick McKinney and available here.
VOTES: See the Senate Virtual Reference guide "About Voting".
LLSDC's Legislative Sourcebook: detailed guides to researching U.S. federal legislation.
For more information on publicly accessible government information, see this guide by Gretchen Feltes of the NYU Law Library: Update: A Guide to the U.S. Federal Legal System: Web-Based Public Accessible Sources
ProQuest Congressional and HeinOnline may have earlier years than the GPO FDsys and other online options. For print copies, check Discovery and the Basic collections tab in this guide. For bill texts, see "Bill Texts & Votes" on this page.