Workers on Cobblestone Hill
![](https://i0.wp.com/whminerarchives.org/wp-content/uploads/2019/10/13-44.jpg?fit=937%2C567)
Worker pouring concrete onto the reservoir, Cobblestone Hill at Altona Dam. From: Book 13- Altona Dam Vol. 1
Miner Institute Online Archives
Worker pouring concrete onto the reservoir, Cobblestone Hill at Altona Dam. From: Book 13- Altona Dam Vol. 1