Does anyone know anything about these German notes:

http://tinyurl.com/t8xdu

pparently, they are not in the Standard Catalog of World Paper money.
They were found among some old German military ephemera. I'm trying to
get an idea what they are worth. I have three types: 1 mark, 2 mark
and 5 mark. Each bears the date 1916. Someone suggested they are
military issues or POW issues. Any information, clues or guesses would
be appreciated.

Thank you,

Jeffrey P