Assertion: airborne yeast | /r/ObjectUse | used in the united states
Facets:
value: almost exclusively
type: DEGREE
Source sentences:
text: In the United States, naturally occurring airborne yeasts were used almost exclusively until commercial yeast was marketed at the Centennial Exposition in 1876 in Philadelphia, where Charles L. Fleischmann exhibited the product and a process to use it, as well as serving the resultant baked bread.