Military Payment Certificates

So I got a bunch of these in, all seem to be from the vietnam/korea era they came in on a bulk lot, at the end of the day I have two questions:
Some rough googling said that they're worth a few bucks more or less a piece, is this accurate? Most are in circulated condition, 3 have writing on them, 1 has a semi-small (across the bill 20% or less) tear.
2nd is anyone around here interested in some history?
4 - 5 cent certs
1 - 10 cent cert
2 - 25 cent certs
1 - 50 cent cert
Some rough googling said that they're worth a few bucks more or less a piece, is this accurate? Most are in circulated condition, 3 have writing on them, 1 has a semi-small (across the bill 20% or less) tear.
2nd is anyone around here interested in some history?
4 - 5 cent certs
1 - 10 cent cert
2 - 25 cent certs
1 - 50 cent cert