<em>Mittelholzer, Walter: Zürich, ETH Zürich, Polyterrasse v. N., 1931 (LBS_MH01-006275, <a href="http://doi.org/10.3932/ethz-a-000298150">http://doi.org/10.3932/ethz-a-000298150</a>)
<em>Mittelholzer, Walter: Zürich, ETH Zürich, Polyterrasse v. N., 1931 (LBS_MH01-006275, <a href="http://doi.org/10.3932/ethz-a-000298150">http://doi.org/10.3932/ethz-a-000298150</a>)
