Australian War Memorial Website containing a summary of the 2/1st https://www.awm.gov.au/collection/U56185

Australian War Memorial Website containing a summary of the 2/2nd
https://www.awm.gov.au/collection/U56186

Australian War Memorial Website containing a summary of the 2/3rd  https://www.awm.gov.au/collection/U56187

Australian War Memorial Website containing a summary of the 2/4th https://www.awm.gov.au/collection/U56189

2/2nd Webpage - very comprehensive; many other links
http://www.2nd2ndpioneerbattalion.com/index.html

A 2/3rd Pioneer soldier’s letters home; many other links
http://brucesanders.wordpress.com/

Photos of 2/1st
http://www.flickr.com/photos/biomechanic/sets/72157622953343001/detail/

Australian War Memorial Roll of Honour (search Unit Name = Pioneer Battalion) https://www.awm.gov.au/commemoration/honour-rolls/roll-of-honour

World War II Nominal Rolls
  https://www.awm.gov.au/research/guide/ww2

National Archives of Australia: Service Records
http://www.naa.gov.au/collection/explore/defence/service-records/army-wwii.aspx

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Pioneer News http://get.adobe.com/reader/

Rocky Creek War Memorial Park
 https://www.monumentaustralia.org.au/themes/conflict/ww2/display/92452-rocky-creek-war-memorial-park

Kokoda Track Memorial Walkway
https://www.kokodawalkway.com.au/about-us/overview/

The Descendants of the Rats of Tobruk Association
http://www.ratsoftobrukdescendants.org.au