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
A real silver dollar has a $25.00 value just for the silver.
There is around .77 ounces in a 1921 US silver dollar.
A US silver dollar from 1840 to 1935 contains .77344oz of pure silver.
john f. kennedy was on the first silver dollar
If you mean a real silver dollar, such as a Morgan or peace dollar the thickness is 2.4mm
The only silver dollar minted by the US Treasury in 1900 was the Morgan Dollar.
ZERO, because no dollar US coins were made dated 1970
because it is a newer and probably better version