I am applying for PRTD. I have 2 questions. In the application they are asking if I have been issued a PRTD or travel document before. I have never received a PRTD before but have received study permit, work permit, immigrant visa. So my first question is are study permit, work visa, and immigrant visa considred as travel documents? My second question is about US visa. I was issued US visa in 2016 and I visited US in 2016 but the visa stamp is no longer in my passport. Should I mention this as it has more than 5 years that I received US visa and traveled there. Thank you.