This file was edited to remove nonessential embedded elements that are not known to be public domain or available under a free license. Scans of books and newspapers, for example, may contain non-free text, illustrations or photographs even if the underlying text is itself public domain. As a result, this file may be missing some media present in the original.
The following reason for this removal was provided:
English: removed non-PD graphics (author: Tadeusz Gronowski (1894-1990)
Autor tej pracy zmarł w 1933 roku, więc ten materiał przeszedł do domeny publicznej w kraju pochodzenia, jak również w państwach i terytoriach, gdzie prawo autorskie wygasa w ciągu 80 lat po śmierci autora.