The coin is referred to as just a "Morgan dollar" all silver dollars have "Miss Liberty" on them. An 1882 Morgan dollar is very common, circulated coins are $30.00-$37.00.
The 1882 Morgan is very common with retail values of $17.00-$26.00 for circulated coins. Real nice mint state examples are $30.00-$35.00
The image on the face of the Morgan Dollar is a rendition of Lady Liberty designed by George T. Morgan.
On the front of a Trade Dollar it has Lady Liberty seated facing the left and on the back below the eagle TRADE DOLLAR. A Morgan Dollar has the head of Lady Liberty on the front.
Money can have various values based on condition and certain stamping. An 1885 Morgan Liberty Head silver dollar can be worth between $20 and $400.
$15.00 to $20.00 in circulated condition
This link shows a 1879 Morgan Dollar: http://www.coinfacts.com/silver_dollars/morgan_dollars/1879_morgan_dollars/1879_morgan_dollar_obv.jpg
There is no such coin. Morgan dollars* were not issued until 1878. If you have a Liberty Seated dollar with that date, its value depends on its condition and mint mark: No mint mark - $400 if very worn, $1000 if moderately worn, $1600 if like new "O" mint mark - $250, $750, $1200 If you have a Morgan dollar with the date 1850 it is a counterfeit. (*) The coin is called a Morgan dollar after its designer. It carries the image of Miss Liberty, not the head of Mr. Morgan.
Assuming it's a more common Morgan dollar, about $13 for its silver content
$15.00 to $20.00 in circulated condition.
Assuming the coin is circulated and has no mintmark, the 1881 Morgan (not a Liberty Head) dollar is a very common coin with retail values of $32.00-$39.00 depending on the grade.
1880 is a common date Morgan dollar, circulated examples are $17.00-$26.00 depending on grade.
Is it a Morgan or Peace dollar? A Morgan dollar features a personification of Liberty with a crown saying "LIBERTY" on it. A Peace dollar has a personification of Liberty with rays of light coming out of her head. The reverse of a Morgan dollar has an Eagle with arrows and an olive branch and a wreath under it. The reverse of a Peace dollar features a perched eagle sitting on a rock inscribed "PEACE". Without knowing the type of coin, it is impossible to state a value.