The iii-VI-ii-V-I Progression
A good bit of info on the subject has already been posted on this site, and in order to avoid a trip to the Office of Redundancy Office, the dozen or so posts are all linked under the "Fourths" category. Check 'em out!
The exercises contained in this post are from a new Shortbook™, which is in the form of 12 individual melodic lines in 4ths, over the basic premise of the familiar iii-VI-ii-V-I chord progression and transposed into all twelve keys.
UPDATE: "Lines in 4ths: The iii-VI-ii-V-I Progression" has been combined with "Fourtitude" as a single 98 page pdf volume "Fourtitude + Lines in 4ths: iii-VI-ii-V7"