How can I obtain a copy of my md state returns

Unlikely you can... unless you kept a copy of it (I think you should for at least 10 years). What do you need it for?

You can contact he Maryland Revenue Administration Division to request a copy of your past return(s) - see:

Frequently Asked Questions About Income Tax (http://taxes.marylandtaxes.com/Individual_Taxes/Taxpayer_Assistance/Individual_Tax_FAQs/Income_Tax_FAQs/q25.shtml)

The site does not say how far back you can go, so I suggest you call and ask.