![Teaser ZF 3-2017: Fahrradweg am Washington National Airport, 1972 Teaser ZF 3-2017: Fahrradweg am Washington National Airport, 1972](https://zeithistorische-forschungen.de/sites/default/files/medien/static/2017-3/Teaser_ZF_3_2017.jpg)
Fahrradweg am Washington National Airport, 1972
(Wikimedia Commons; National Archives and Records Administration [NARA], Environmental Protection Agency [EPA]; Foto: Erik Calonius/Public Domain)
Fahrradweg am Washington National Airport, 1972
(Wikimedia Commons; National Archives and Records Administration [NARA], Environmental Protection Agency [EPA]; Foto: Erik Calonius/Public Domain)