Mining 1

Autor:

Staff writers

Credit:

Work in the Field Under the Engineer-in-Chief, B. E. F.: Geological Work on the Western Front (PDF). The Work of the Royal Engineers in the European War, 1914–19. Chatham: The Secretary, Institution of Royal Engineers. 1922. OCLC 613625502

Krótki link:

https://www.plwiki.pl/b/5977e

źródło:

Wikimedia Commons

Wymiary:

865 x 508 Pixel (372954 Bytes)

Opis:

Section showing mining at Messines Ridge, Ontario Farm–Boyle's Farm

Licencja:

Public domain