CRS Reports are produced by the Congressional Research Service, the public policy research arm of Congress and are heavily researched and written by experts in the field on legislative issues. CRS Reports are available fulltext from 1916 to the present.
From the Congressional Research Service homepage:
Note: there might not be a CRS report for every topic - but do try and see if there is!
Follow these steps:
Results, notice you can change the display from relevance to sort by date (most recent first)