| PDF | Brookman Lester G. The United States Postage Stamps of the 19th century | | | Hobby | postzegelpiet | 4 years, 8 months | 259.72 MB | NZB | | |
| ePub | Yvert & Tellier - Classiques du monde 1840-1940 (2005) postzegel catalogus | | | Hobby | postzegelpiet | 4 years, 8 months | 519.91 MB | NZB | | |
| PDF | Scott 2009 Standard Postage Stamp Catalogue - 6 Volumes | | | Hobby | postzegelpiet | 4 years, 8 months | 1.35 GB | NZB | | |
| PDF | Michel Eisenbahn (2015) postzegelcatalogus treinen | | | Hobby | postzegelpiet | 4 years, 8 months | 692.84 MB | NZB | | |
| PDF | NVPH - Speciale Catalogus 2002 van de postzegels van Nederland en Overzeese Rijksdelen | | | Hobby | postzegelpiet | 4 years, 8 months | 239.78 MB | NZB | | |
| PDF | 2014 Scott Specialized Catalogue of United States Stamps and Covers | | | Hobby | postzegelpiet | 4 years, 9 months | 476.05 MB | NZB | | |
| PDF | Postzegel albumbladen wereld | | | Hobby | postzegelpiet | 4 years, 9 months | 128.98 MB | NZB | | |