Walter Burger, Begegnung, 1968. Definitely the piece he is known for.
I don't have information on the title for this.
Morgen, 1994
In 1993, a Swiss Aids awareness organization (AHSGA) started collaborating with artists for a series of lithographs. Above is Burger's contribution.
"Gerade Menschen, die mit dem HI-Virus leben müssen, empfinden das Leben oft als deutlicher, bewusster, mit geschärftem Blick." — Walter Burger
My translation is this: People who live with the HIV virus often have an especially clear consciousness and keen eye.