Old bills value?

I have found some old bills in the past working the register, and I was wondering what they might be worth.:smile

1990 $20 bill:
Front: http://imageshack.us/photo/my-images/228/img0157bl.jpg/
Back: http://imageshack.us/photo/my-images/819/img0158pa.jpg/

1969 $5 bill:
Front: http://imageshack.us/photo/my-images/854/img0159z.jpg/
Back: http://imageshack.us/photo/my-images/21/img0160bt.jpg/

1950 $10 bill:
Front:http://imageshack.us/photo/my-images/717/img0145dmi.jpg/
Back:http://imageshack.us/photo/my-images/641/img0146eo.jpg/

Thanks!

 

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Thats awesome! id keep them all except the 20 dollar bill.Even though it has the nice old design, its just to new to me. But Def keep the other bills even tough they have a small markup value, they can go up in value faster and also just look cool and oldschool!