<em>Comet Photo AG: Recycling von Telefonbüchern, 1975 (Com_LC1469-001-014, <a href="http://doi.org/10.3932/ethz-a-001035153">http://doi.org/10.3932/ethz-a-001035153</a>)
<em>Comet Photo AG: Recycling von Telefonbüchern, 1975 (Com_LC1469-001-014, <a href="http://doi.org/10.3932/ethz-a-001035153">http://doi.org/10.3932/ethz-a-001035153</a>)
