Martin Erler (c. 1920 - 11 August 2014) was a German philatelist who was an expert on the revenue stamps of Germany who with John A. Norton (died June 1980) wrote the only comprehensive catalogue of German revenue stamps.
Martin Erler (c. 1920 - 11 August 2014) was a German philatelist who was an expert on the revenue stamps of Germany who with John A. Norton (died June 1980) wrote the only comprehensive catalogue of German revenue stamps. (en)
Martin Erler (c. 1920 - 11 August 2014) was a German philatelist who was an expert on the revenue stamps of Germany who with John A. Norton (died June 1980) wrote the only comprehensive catalogue of German revenue stamps. (en)