Office work; arrival ceremony for Mexican President & Mrs. Diaz Ordaz; Johnsons ride with Mexican President to Blair House; Lady Bird lunches with family; Lady Bird has tea with friends; Lady Bird to hair salon; heads of state gifts; Johnsons greet guests visit upstairs & receiving line; Lady Bird mentions guests; exchange of toasts; new strain of wheat for underdeveloped countries; entertainment is Herb Albert & Tijuana Brass introduced by Lynda Johnson; former Mexico President Mateos in coma; Vietnam