Looking for photos of Czech patriots during WWII

Hi,

We are looking for photos of three Czech patriots during WWII who were responsible for the attempted assassination and subsequent death of Heydrich in 1942. They are: Josef Valcik, Jan Kubis, Josef Gabchik. We would like to include the three photos on the back of a book cover. Does anyone know if they are available through a public domain site? I have found several photos on a few European web sites, but do not receive an email reply to my inquiry. They must be fairly high resolution. I thank you for your time.