<em>Comet Photo AG: Recycling von Telefonbüchern, 1975 (Com_LC1469-001-013, <a href="http://doi.org/10.3932/ethz-a-001035154">http://doi.org/10.3932/ethz-a-001035154</a>)
<em>Comet Photo AG: Recycling von Telefonbüchern, 1975 (Com_LC1469-001-013, <a href="http://doi.org/10.3932/ethz-a-001035154">http://doi.org/10.3932/ethz-a-001035154</a>)
