<em>Sonderegger, Christof: DDR, Ostberlin, alte Stadtviertel, 09/1976 (Com_L24-0485-0004-0005, <a href="http://doi.org/10.3932/ethz-a-001026141">http://doi.org/10.3932/ethz-a-001026141</a>)
<em>Sonderegger, Christof: DDR, Ostberlin, alte Stadtviertel, 09/1976 (Com_L24-0485-0004-0005, <a href="http://doi.org/10.3932/ethz-a-001026141">http://doi.org/10.3932/ethz-a-001026141</a>)
