The Covenant books are organized as follows:

"A Treatise on Form and Substance":  Creo 3, Muto 3, Perdo 3.
This is a basic introduction to three Techniques, illustrating how to
create material, how to destroy it, and how to change its nature. It
is a commonplace primer, well-worn, useful for explaining fundamentals
to apprentices. 

"An Introduction to Intellego": Intellego 5.
This is a basic and commonplace text, handed down through the
generations.

"A Basic Primer of Wards ": Rego 5, plus the spell Watching Ward (ReVi 15).
A standard primer on the art of Rego, focusing upon the construction of
ward spells. Your copy is, unfortunately, incomplete; it was evidently
copied by a mundane scribe, and most of the section detailing the 
commonplace ward spells is so badly garbled as to be useless.

"The Nature of Living Things": Animal 3, Herbam 4.
This enormous tome was evidently written by a complete madman. It is
devoted to thoroughly bizarre descriptions of mundane plants and animals,
and the even more bizarre ways in which they can be affected by magic.
The handwriting becomes nearly illegible in places, where the magus
descends into evident gibbering lunacy; one might guess, from the work,
that the magus was fond of sampling wild mushrooms. The moments of 
lucidity are, however, almost frighteningly clear, and the rest of
the writing is likewise vivid. This book was sold to you for a very
low price; it might have been stolen from another Covenant's library
(or taken from the author himself). It is possible that this is the
only copy of this book available; it is somewhat unlikely that it
would have been copied by others.

"Master of the Wind and Waves": Aquam 9, Auram 9, plus the spell Voice
of the Lake (InAq 25).  This book was written by a weather-mage of
some note; it is rich in detail, but it is written in the style of an
autobiography, and the text is peppered with a lot of travelogue
detail, including, of course, how the author singlehandedly saved
fleets of ship from fantastic sea monsters of varioussorts. 
Unfortunately, most if not all of this "color" seems to be wholly
fictional; nonetheless, if one is willing to pick through the rather
grandiose style, there is much to be learned here.

"Investigations into Death": Corporem 7.
This is a meticulously detailed study of the art of Corporem. It 
describes, in precise detail, investigations of corpses and creative
ways of killing people, before going on into speculations on the 
effects of magic upon the human body. The author is a stickler for
detail and accuracy, and writes in a precise, detached, very dry
style.

"The All-Consuming Flame": Ignem 2.
This is a heavily philosophical text which muses upon the effects of
fire on the world, and how practitioners of the Art of Ignem will
eventually be consumed by the forces they wield. Though it doesn't
describe much about the Art, it does touch on enough of it, amid
the philosophical ramblings, that some basic information can be
gleaned from it. It's better than no Ignem book at all, at least.

"Visions Unseen": Imagonem 2, Mentem 2.  
This work, written by a Criamon magus, is so obfuscated by
dream-ramblings and strange symbols that it is far less useful than
one would expect. It is an allegorical tale of a man's journey to
speak with the spirit of his father, useful for teaching basics to
bored apprentices.

"The Properties of Rocks": Terram 6.
This is a catalog of rocks and their properties, written by a rather
obsessive magus. In investigating rocks, the magus came up with a
series of magical tests; the descriptions of his techniques 
constitute an excellent, if oblique, introduction to the art of
Terram. 

"An Introduction to the Theory of Magic": Vim 2, Magic Theory 6, plus
the spells Scales of the Magical Weight (InVi 15), Gather the Essence
of the Beast (MuVi 15), and Aegis of the Hearth (ReVi 10).  
This is an extremely basic, commonplace text which contains several
"standard" spells of the order, and explains the fundamentals of
Bonisagus' theory of magic. The weighty tome contains a number of
exercises intended to teach magic theory to apprentices, though it is
sufficiently thorough that it is useful reference text for full
magi. Your copy of this is incomplete, missing most of the sections
describing the art of Vim.