Keywords: FMIB 38279 Sorting room, in which skillful operators classify buttons into 12 grades.jpeg check categories 26 August 2015 2 Sorting room in which skillful operators classify buttons into 12 grades Subject Pearl button industry Tag Shellfish 1921 Cite book Fresh-water Mussels and Mussel Industries of the United States Coker Robert E Washington DC Government Printing Office 1921 Bulletin of the United States Bureau of Fisheries vol 36 1917-1918 Plate XL-2 Creator Robert Ervin Coker PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 38279 Images from the Freshwater and Marine Image Bank to check Robert Ervin Coker Shell buttons |