The Colorado Bureau of Investigation is distributing playing cards with photos of unsolved homicide victims featured on the face, hoping to get people to help solve cold cases by providing a few details with each case and a phone number to contact police.

One deck marks 52 unsolved cases, and authorities have two additional decks in the works. There are currently 1,600 unresolved cases in Colorado, including 1,330 homicides.

In the first deck of cards, the seven of diamonds and the seven of hearts feature two women whose bodies were found south of Breckenridge in 1982. Bobbi Jo Oberholtzer was found with a gunshot wound near the summit of Hoosier Pass. Annette Schnee was found with a similar wound six months later in rural Park County.