The series started around 1910.
Level I (easy)
Level II (intermediate, 1-3 pos)
Level III (intermediate 1 to 5 pos)
Level IV (difficult all pos)
Level V (fairly difficult)
Level VI (difficult)
Favorite melodies for violin and piano, by contemporary composers, some original and some arranged, graded in six levels for amateur use. Some items also have cello parts.