Philadelphia Mint production question.

Does anyone know why the Phila mint did not strike Jefferson nickels or Kennedy halves during 1968, 1969 and 1970? If so, where might I read about it?
I haven't found the answer and the question came up in Kranky's trivia post.
I haven't found the answer and the question came up in Kranky's trivia post.
Gilbert
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Comments
THE US MINT stopped puting mint marks on coinage for 3 years due to public haording of coins. The government felt that if there were no identifying mint mark, less people would be inclined to hold them. After 3 years of the numismatic world moaning...mint marks were restored in 1968.
Go BIG or GO HOME. ©Bill
para one - did you just forget to delete that?
para two - what does that hafta' do with, well, anything?
Guess I'm gonna hafta' forward the question to Alan Herbert of NN.