Due to timing of receipt of tax docs, I submitted a return in Feb and an amended return in Mar. How can I access the Feb return in TurboTax? TT only shows amended.

If you did not save a PDF of the tax return before amending then the original tax return is no longer available.

Go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf