The following resources are available in L3. They are transcripts of talks which link to both audio and audio/video of the content. They are not showing up in L4. Is this because of their linkage with a/v which is yet to be incorporated in L4? Other resources from Barton's Wallbuilders collection have links to audio or video. These tend to be books in their own right, not merely transcripts.
America's Godly Heritage
Keys to Good Government According to the Founding Fathers
Separation of Church and State: What the 'Founders Meant
Setting the Record Straight: American History in Black & White
The Spirit fo the American Revolution
A Spiritual Tour of the United States Capitol