On 4 April 1852, Major Logue, an Australian colonial settler, wrote the following in his diary:

Exclusive: Stories of murders passed down by Yamatji elders are confirmed by a cipher hidden in the 1850s journals of prominent Western Australian pastoralist Major Logue. Now descendants on both sides want to break the shame and silence

• Read more from Guardian Australia’s series The Descendants here

By Lorena Allam, Sarah Collard and Ella Achibald-Binge. Photographs: Tamati Smith. Interactive: Nick Evershed, Andy Ball and Victoria Hart

Warning: This article contains historical records that use racist and offensive language, and descriptions of events that will be distressing to some readers