https://www.awm.gov.au/articles/blog/rain-mud-the-ypres-passchendaele-offensive
https://collections.museumvictoria.com.au/items/1706367
https://collections.museumvictoria.com.au/items/1706356
https://collections.museumvictoria.com.au/items/1706332
https://collections.museumvictoria.com.au/items/1706365
https://collections.museumvictoria.com.au/items/1706366