A Marc Lithos
I have 37 "lithos" by this artist, 10 larger and 27 smaller - none framed. Scenes range from famous sites in Europe to the northeastern United States including scenes around New York City. On the back of several of these "lithos" are the artist's swatches of colors with the colors identified in pencil that were used in the actual painting, along with the standard "Stehli Freres" etc etc designation.
I obtained these almost 35 years ago at an estate sale, along with several other artists' work, including 2 art "lithos" by A. Gasteiger, which I found later to be Anna Gasteiger.
There was a 3rd artist's work in with this treasure trove. However, these are not lithos but original art work, but some works appear to be "assignments" one would expect for an art student, including a sketch book of skeletal depictions of hands, arms, and portions of the human body. There were also finished pieces by this same artist - not published - but original works done in maybe charcoal on a thin blue paper of various sizes -- of birds, famous European statues, beautiful women, etc - absolutely beautiful!