"ΚΑΤΑΛΟΓΟΣ ΞΕΝΩΝ ΓΡΑΜΜΑΤΟΣΗΜΩΝ" by Petros Koroneos, issued in 1936, not complete, pages from 1 to 124 and "ΕΛΛΑΣ 1861-85 ΜΕΛEΤΗ ΚΑΙ ΤΑΞΙΝΟΜΗΣΙΣ των Ελληνικών Γραμματοσήμων του πρώτου τύπου" by N. Garas, issued in 1936, not complete, pages from 1 to 40. Both books in poor condition.