When blue is blue

Scientific treatise and study on the composition of the paint on the Protectorate 5h blue linden leaf stamp. Study of the dependence of the amount of paint on the color shade of postage stamps.

03. 05. 2025
Complete description

Post and postal services:
Open letter to the director of the Slovak Post and other people

Open letter to the director of the Slovak Post and other people
Author: Vojtech Jankovič
Source: blog.sme.sk
Published: 05. 11. 2013 09:02

Angličtina / English

Use translation by Google Translate (no guarantee).

Otvorený list s poďakovaním....

Základné informácie:


Author: Vojtech Jankovič
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