A k-term quasi-progression of diameter d is a sequence {Xl,... ,xk} for which there exists a positive integer l such that l < Xi-Xi-1 < l+d, for all i = 2, ... ,k. Quasi-progressions may be thought of as arithmetic progressions with a certain...
Robert J. Shackleton of Louisville, Kentucky, President of the Shackleton Piano Company, inspecting a shotgun with unidentified man. The photograph has been cut to an irregular shape, painted on, and discolored from age.
Portrait of E.D. Axton and son William Fitch Axton of Louisville, Kentucky, looking at a portrait of Wood F. Axton. Article attached to back of image: Axton Portrait Unveiled. Handwritten on back: E.D. Axton inspecting portrait of his late brother...
Sketch of men on the assembly line at the Ford Motor Company Assembly Plant, Louisville, Kentucky. They are inspecting frames of cars. Image has been touched up. Possibly a drawing instead of photograph.
Laborers; Trails & paths; Caves; United States. Works Progress Administration
Working on underground trail at Mammoth Cave, Kentucky. Twenty men at work lifting or inspecting the rocky ground around a cavern. In the background is a forested area.
