Keywords: FMIB 49827 Sphacroma pentodon working on surface of an untreated pile in a thick scum of crude oil at Monticello SS Company's wharf at.jpeg check categories 17 September 2015 3 Sphacroma pentodon working on surface of an untreated pile in a thick scum of crude oil at Monticello S S Company's wharf at Vallejo California November 9 1920 Subject Piling Civil engineering Weathering Sphacroma Tag Coasts 1921 Cite book Report on the San Francisco Bay Marine Piling Survey San Francisco Bay Marine Piling Committee San Francisco CA San Francisco Bay Marine Piling Committee 1921 1st Plate 11 Fig 2 San Francisco Bay Marine Piling Committee PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 49827 Images from the Freshwater and Marine Image Bank to check San Francisco Bay Marine Piling Committee Piles structural Weathering |