2009-01-222009-01-221903-08Indiana State Board of Health. Monthly Bulletin. 1903; 5(8) :90.0019-6754https://hdl.handle.net/1805/1763[Chalk dust remover]Fujitsu fi-4220c2, Adobe Photoshop CS3, 166 KBPage 90, center left approximately 2 1/2 X 1 1/4 in.Photograph in periodical.JPEGen-usErasersSimple MachinesSchool HygieneJones, J.A.(Plymouth)InventionsDustChalkIndianaImage