"Two-score" was replaced in the tenth (1990) and following Urantia Foundation printings with "twoscore." Aside from being an unnecessary edit, it appears to be an otherwise unknown compound word, found in neither the OED nor Webster's.

Original Paragraph:

^{P1044:2, 95:2.3} For ages the Egyptian peoples had been given to the worship of nature gods; more particularly did each of the two-score separate tribes have a special group god, one worshiping the bull, another the lion, a third the ram, and so on. Still earlier they had been totem tribes, very much like the Amerinds.