Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 10 · column 1 of 6 · from the scan, no model involved

Census
From Page A1
The “median income” is the level at which half of households have higher incomes and half have lower incomes. This measure is commonly used when income levels are quite skewed. For example, 24 percent of households in the county have incomes of $25,000 or less, whereas 26 percent have incomes of $75,000 or more.
93.6%