You can see different types of layout in the book “The Villas of the Ancients Illustrated” by Robert Castell.
The preface is organized in a column. Part one (Laurentium) in two columns: on the left side Latin text (with notes at the bottom of the page) and on the right side English translation. The remarks on Larentinum are again organized in a single column in English.
Part two (Varro Columella) is also organized in one column and has no remarks while Part III (Tuscum) follows the same rhythm as Part I: i.e. two columns, one in Latin and the other in English, up to the remarks, which are organized in a single column in English.
At the beginning of each part there is a drawing of the landscape, probably of the place where the villas are located, while at the end of each part there is a particular drawing that resembles a stamp.
During the reading you can find drawings of architectural details but the main drawings (i.e. architectural drawings, perspective views, maps of the place and landscape plans) are all at the end of one part and occupy two pages of the book per drawing.
They are therefore beautiful large and very precise drawings, a marvel, on the sides of which there is a legend to better read the data that the architectural drawing expresses.
The images at the end of each part play an important role as they conclude all the literary part that precedes them.
Sometimes words are not enough to imagine a house or a space with certain characteristics. The graphic representation therefore helps the reader to immerse himself in the spaces treated in the written part and make him aware of the beauty of these architectural works.
On the other hand, the images are also related to the title of the book as they illustrate these villas.
The organization of the text and images suggests a type of reading and use of reference.