Great Colonnade at Apamea columns display two main designs: a plain one, and the distinctive spiral-flutes. Archaeologist Jean Lassus argues that the former dates back to the Trajanic period, while the latter to that of Antoninus Pius. The colonnade's porticoes were paved with extensive mosaics along the full stretch of the colonnade. Under the Byzantine Emperor, Justinian I, several parts of the colonnade were restored. The street was narrowed to by adding a sidewalk on either side. Several stretches of the street had their Roman pavement replaced with a new pavement made of squared blocks of limestone. The new pavement also covered a completely
White Pine Series of Architectural Monographs photographs and measured drawings complemented the "Comparative Details" feature which published construction details for contemporary projects. The Monograph series was ended abruptly in June 1940. Many of its contributors became involved in the Historic American Buildings Survey. Eagerly collected by architects and historians, the monographs have been re-issued in bound editions several times. In 1987 the National Historical Society of Harrisburg, Pennsylvania began publishing a series of hardbound books, the Architectural Treasures of Early America, drawn entirely from the "White Pine Monographs". They reorganized the individual editions into geographic regions and re-set all the type in order to produce a