Arbeitsgemeinschaft USA CANADA | ArGe USA CANADA |
Bund Deutscher Philatelisten e.V. | BdPh |
Forum des Bundes Deutscher Philatelisten | BdPh Forum |
American Philatelic Society | APS |
Philatelistische Bibliothek Hamburg | Philatelistische Bibliothek Hamburg |
Linn's Stamp News und Scott Katalog | Linn's |
Philatelistic Foundation | Philatelistic Foundation |
The Canal Zone Study Group | CZSG |
TPO & Seapost Society - German Sea Post Offices on German and American Ships | TPO & Seapost Society |
The digitized "Postal Bulletins" and "Postal Laws & Regulations" of the USA | US POSTAL BULLETINS and PL & Rs |
"Statue of Liberty" and "Ellis Island" - Archive about travelers arriving by ship (Also US citizens) | The Statue of Liberty - Ellis Island Foundation, Inc. |
National Archives | National Archives |
Example: National Archives - Post Office Records | National Archives - Post Office Records |
Europeana - Network of many European libraries (also the one in Hamburg) - here the newspapers (English site) | Europeana - Newspapers |