<p>Yes, you can mix online/paper recommendations.</p>
<p>I don’t know what you mean by an “abbreviated application,” but if a teacher is writing a recommendation be sure to give him the list of colleges you need recommendations for and their due dates. For the superintendent who is not submitting online, you’ll also want to give him one copy of the common app recommendation form, and stamped and addressed envelopes to all of the colleges you’re applying to.</p>
<p>This system may vary from school to school (or even teacher to teacher), but the above should be adequate in most cases.</p>