@Article{gh-21-1-1966,
AUTHOR = {Piveteau, J.-L.},
TITLE = {L'annuaire des PTT comme moyen d'investigation géographique},
JOURNAL = {Geographica Helvetica},
VOLUME = {21},
YEAR = {1966},
NUMBER = {1},
PAGES = {1--6},
URL = {https://gh.copernicus.org/articles/21/1/1966/},
DOI = {10.5194/gh-21-1-1966}
}