朝鮮總督府 Government General of Chosen (ed.), 『佛國寺と石窟庵』 Bukkokuji Temple and Sekkutsu-an Cave in Keishu, Chosen, March 1938.
Its associated commentary by Fujita Ryosaku 藤田亮策 does not give the date and author of the picture explicitly. It was taken sometime before the restoration project by the Government-General of Chosen in 1923. Judging from the preface, it was taken either by Imaseki Mitsuo 今關光夫 or *Sawa Shun'ichi 澤俊一. We can see the state of Seokguram before the restoration.
The ruin of Seokguram. Nanshu scanned this picture from: :朝鮮總督府 Government General of Chosen (ed.), 『佛國寺と石窟庵』 ''Bukkokuji Temple and Sekkutsu-an Cave in Keishu, Chosen'', March 1938. Its associated commentary