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Mostly Classical: Weekly and Arganbright has a series of duet books through the KJOS publishing company. Here's a link to all the books they publish through them: http://www.kjos.com/sub_section.php?division=5&series=123 This is mostly classical, but there are some Joplin Rags in this list.
Non classical: There is quite a bit of good teaching literature out there for duets: Robert Vandall: Celebrated Piano Duet series and Celebrated Christmas Duet series Catherine Rollins: Dances for Two Books 1 & 2 Eugene Rocherolle: The Way We Danced and other duet books Martha Meier: Jazz Rags & Blues for Two series
There are plenty of single duet pieces by the above composers that would be fun to check out. Some of them are intermediate level concerto's.
me and Augustina play alot of duets from Alfreds duet books. Those are easier and more towards early intermediate duets. I think we have alfreds piano duet books level 1,2, and 3. 3 is probably around intermediate or maybe its level 4 ANyway check it out if you want! They are all one piano with 4 hands
I am currently uploading all of my written piano sheets onto my blog to make things easier. I also have written out a few more sheets. All free check it out if you want Any questions, PM me