While teaching at Bunbury High School in the late 1950s , de Laeter attended a science teachers ' conference in Sydney , where he described the following :
De Laeter began teaching in 1957 at the Perth Technical College .
While teaching at Bunbury High School in the late 1950s , de Laeter attended a science teachers ' conference in Sydney , where De Laeter described the following :
De Laeter began teaching in 1957 at the Perth Technical College .