James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 1
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 2
James St. John:
Dacite ash & dacite pumice (15 June 1991 eruption of Mt. Pinatubo, Luzon Volcanic Arc, western Luzon Island, northern Philippines)
James St. John:
Gold & quartz (Benguet Consolidated Gold Mine, Philippines) 1
James St. John:
Gold & quartz (Banquet Consolidated Gold Mine, Philippines) 2
James St. John:
Gold & quartz (Banquet Consolidated Gold Mine, Philippines) 3
James St. John:
Eruption of Pinatubo Volcano (12 June 1991) (Luzon Volcanic Arc, Philippines) 1
James St. John:
Eruption of Pinatubo Volcano (12 June 1991) (Luzon Volcanic Arc, Philippines) 2
James St. John:
Eruption of Pinatubo Volcano (15 June 1991) (Luzon Volcanic Arc, Philippines)
James St. John:
Eruption of Pinatubo Volcano (22 June 1991) (Luzon Volcanic Arc, Philippines)
James St. John:
Eruption of Pinatubo Volcano (1 August 1991) (Luzon Volcanic Arc, Philippines)
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 3
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 4
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 5
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 6
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 7
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 8
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 9
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 10
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 11
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 12
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 13
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 14
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 15
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 16
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 17
James St. John:
Dacite pumice from the 15 June 1991 explosive eruption of Mt. Pinatubo (Luzon Island, Philippines) 18