Thanks for this timely advice! I found several more of the Kennedy half dollars that are dated before 1971 (and will look into the collectability of these before selling them for silver. Also, I misspoke earlier regarding having lots of other Morgan dollars — I only have 2 Morgan dollars, the rest are actually Eisenhower dollars which seem to be worth only face value. Other than the 2 Morgan dollars and the 16 pre-1971 Kennedy half dollars, I have one Peace dollar (in very grungy condition though) and 2 Franklin half dollars. I also have 14 Susan B. Anthony dollars (all dated 1979) but it seems these are only worth face value.
So the coins going to the bank on my next trip into town are gonna be these:
Eisenhower dollars
Kennedy half dollars dated 1971 and later
Susan B. Anthony dollars