W.W. Norton has published the latest three volumes of the LBJ reference series (The Presidential Recordings: Lyndon B. Johnson, vols. 4/5/6), spanning the period February through May 1964. It is available for purchase online at amazon.com and Barnes & Noble.
You can listen to some sample conversations from these volumes below. To return to the main menu after each conversation, refresh this page in your browser. Alternatively, you can open these in a new browser window here.