1. |
stamps.org |
|
2. |
filatelia.fi |
|
3. |
usps.com |
|
4. |
uspcs.org |
|
5. |
pennypost.org |
|
6. |
essayproof.net |
|
7. |
westerncoversociety.com |
|
8. |
csalliance.org |
|
9. |
hawaiianstamps.com |
Hawaii Philately |
10. |
si.edu |
|
11. |
rossitertrust.com |
|
12. |
rpsl.org.uk |
|
13. |
paphs.org |
|
14. |
njpostalhistory.org |
|
15. |
siegelauctions.com |
|
16. |
jameslee.com |
James E. Lee |
17. |
veratrinder.org |
Vera Trinder |
18. |
vaccari.it |
Vaccari |
19. |
loc.gov |
|
20. |
coppoweb.com |
|
21. |
atms.ch |
|
22. |
princelystates.com |
|
23. |
blueyonder.co.uk |
|
24. |
mclstamps.co.uk |
|
25. |
chilecollector.com |
|
26. |
interpostalseals.com |
|
27. |
rmpldenver.org |
|
28. |
postalhistoryfoundation.org |
|
29. |
www.bl.uk |
|
30. |
posten.se |
Stockholm, Sweden |
31. |
stamplibrary.org |
|
|