TRIPARTITE BALKAN COOPERATION: New York, 29 – (From our correspondent A.A. Antonakakis). The American press focused at great length today on the question of military cooperation between Greece, Yugoslavia and Turkey. According to reports from Belgrade, a full agreement in principle has been reached on military cooperation between the three countries. However, the agreement will not be put in writing. GREECE AND YUGOSLAVIA: Talks between senior Greek military officials and members of the Yugoslav military mission were held on Sunday morning (December 28) and yesterday and are to continue today and tomorrow (…). The premier, Field Marshal (Alexandros) Papagos, said that joint talks between Greece, Yugoslavia and Turkey will continue later. CHILDREN’S ENCYCLOPEDIA: Alikiotis Press has just published the second and final volume of the Children’s Encyclopedia by Mrs Antigone Metaxa. It is the best and most original work ever published for Greek children. The first volume received enthusiastic reviews. NEW YORK PHILHARMONIC: On New Year’s Day at 11 a.m., Athens national radio station will broadcast a recording of a concert by the New York Philharmonic with violin soloist Gino Francescatti, conducted by Mr Dimitris Mitropoulos.