FOOTNOTE WITH SECONDARY SOURCES THAT NOTICE THE RELEVANCE OF OCTAVO AND HOW THEIR ANALYSIS AND DATA IS DIFFERENT FROM OURS). We can measure this by looking at a simple title count of documents published in different formats, or we can study the paper consumption of these formats in which case we are focused on the print area of the documents instead of counting the number of documents. We find the study of the print area quite useful (print area meaning the total number of documents printed and counting their pages and size) and our choice in this article has been to examine particularly the paper consumed in the printed documents also so that we can compare our findings to our earlier studies that also focus on paper consumption. When we examine the publishing trends of book formats in the HPBD, we notice that at a general European level the rise of octavo format is particularly strong during the eighteenth century (fig.???). This is confirmed by ESTC ((fig.???) and SNB (fig.???) where Octavo is not only the fastest gainer of the market, but also holds the largest share by the end of the eighteenth century. If we look at particular places with respect to octavo share in HPBD, a striking feature is the octavo share in German cities of Frankfurt (fig.???), Leipzig (fig.???), Halle (fig.???) and Berlin (fig.???). The manner in which folio drops and octavo rises in German soil during the eighteenth century suggests that octavo format was the high rising star of the Enlightenment.