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 23 · column 3 of 5 · from the scan, no model involved

1/2" x 4' x 8' R-Value 3.6 Higher R-Values mean greater insulating power. Ask for the fact sheet on R-Values.
*6.35
84.8%