Thirty Easy Duets in All Keys for Two Flutes by Louis Moyse. McGinnis & Marx, 1960, SS, 45 pages, score format. The duets in this book (despite the title) range from the intermediate level to the advanced high school/early college level (especially in the extended keys). In addition, the parts are generally of equal difficulty even though the cover says pupil and teacher. This will be excellent sight reading material and is a great value.