Where do you find historical data for the Barclay's US Aggregate Bond Index?

Historical data for the Barclay's US Aggregate Bond Index can be found on financial market data platforms such as Bloomberg and Reuters. Additionally, the official website of Bloomberg Barclays (now part of S&P Dow Jones Indices) provides access to index performance and historical data. Many investment research platforms and financial institutions also offer this data through their analytics tools or reports.