It depends on how you're using the term "silver dollar"
If you mean the $1 bullion pieces sold for their metal content, they have a picture of Miss Liberty.
If you mean the golden-colored dollar coins meant for circulation, they're just called dollar coins, not silver dollars, because they're made of brass. Some collectors' versions carry a picture of Sacagawea, and other collector and circulation versions carry pictures of the 5th - 8th presidents: James Monroe, John Quincy Adams, Andrew Jackson, and Martin Van Buren.
There is 24 grams of silver in a 1891 US silver dollar.
There is a Silver Eagle, which is a bullion coin worth almost $20 at the current silver price, with a face value of $1.
There is no silver in a 1972 US half dollar.
It is made of 40% silver and has a melt value of about $2.50 as of 08/2008
There is around .77 ounces in a 1921 US silver dollar.
A real silver dollar has a $25.00 value just for the silver.
A US silver dollar from 1840 to 1935 contains .77344oz of pure silver.
john f. kennedy was on the first silver dollar
because it is a newer and probably better version
The only silver dollar minted by the US Treasury in 1900 was the Morgan Dollar.
If you mean a real silver dollar, such as a Morgan or peace dollar the thickness is 2.4mm
ZERO, because no dollar US coins were made dated 1970