Here ya go -
Nickels - 1942-1945, 35% silver, but only the 1942's with a mintmark (P, D or S) above the Monticello.
Dimes - 1964 and older, 90% silver
Quarters - 1964 & older, 90% silver
Halves - 1965-1970, 40% silver; 1964 & older and some 1976S proofs, 90% silver
Dollars - 1935 & older and Eisenhower proofs (S mintmark), 90% silver