The legendary primer on Vim, by Erchantrudis Bonisagi
This copy is a codex solitus octonarius in parchment bound between hornbeam covers

An exceptional primer by Marozia Flambonis
This copy is a codex solitus octonarius in parchment bound between hornbeam covers

The recognized Fundamen Herbae, by Vuissance Merinitae
This copy is a codex solitus octonarius in parchment bound between oak covers

The standard primer on Intellego, by Ricardo Criamonis
This copy is a codex solitus octonarius in parchment bound between hornbeam covers

The famous work on Imaginem by Cantacuzenes Jerbitonis
This copy is a codex solitus octonarius in parchment bound between oak covers

A remarkably clear and interesting introduction to the Art of Auram, authored by one of the known masters of the Form, Archimagus Pietro Flambonis.  Although Pietro founded the Jovian Lineage of lightning-wielders in Domus Flambonis, this book is surprisingly free of emphasis on lightning. Rather, the tome is a clear and well-constructed introduction to the Art of Auram. The breadth of coverage is impressive. This could become another Fundamen, given sufficient time and number of copies - Pietro has not required Ius Iurandum Vaccae Vitulaeque for this summa, but bids anyone to copy and share it freely.
This copy, a codex solitus crassus, was made in 1262 AD, from the copy at Porta Germaniae.