* [https://drive.google.com/file/d/1OdLXrosGK8ruo7LgX88UsYVoUnSUOOaF/view] Brochure del 1959 (dalla [https://pencollectorsofamerica.org/reference-library/sheaffer/ Reference Library] della PCA) | * [https://drive.google.com/file/d/1OdLXrosGK8ruo7LgX88UsYVoUnSUOOaF/view] Brochure del 1959 (dalla [https://pencollectorsofamerica.org/reference-library/sheaffer/ Reference Library] della PCA) |