Numismedia.com has a section for the GSA
Morgan dollars. Click on the MS-61-70 link and you'll see the fair market retail values for the uncirculated grades. This site will give the range of prices for your dollars, which exactly you won't know until you get them graded by someone familiar with the series. If you're intent is to sell them then expect to get less than those values if you sell them to a coin dealer.
Ed
ANA LM-3175