In the last century, throughout most Middle Eastern countries, it was common to give the distances between cities in walking distances. For example, Khaybar is ten days' journey by foot to Jeddah. See also. Pacing (surveying) Pace (unit) League (unit) Parasang; Biblical mile; References
A mass-market paperback is a small, usually non-illustrated, inexpensive bookbinding format. This includes the UK A-format books of 110 mm Ã 178 mm (4.3 in Ã 7.0 in) and the US pocketbook format books of a similar size.
So while content and genre no longer determine whether a book is a mass-market or trade paperback, the bookâs size, the quality of its paper, the way it is displayed, its price, the way it is distributed and the place it is sold all go into the definition.