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This is a very good book indeed, but it is not quite the book I thought it was. So let's deal with that first. The title suggests that this is a book about differential forms. That's not quite right. Instead, it is a part of Cartan's course on differential calculus. It includes a long chapter on, yes, differential forms, but there are also chapters on the calculus of variations and on differential geometry. Material from the first part of Cartan's differential calculus text is assumed and often referred to. As far as I know, that volume has not been published in English. Indeed, the Cours de calcul différentiel (whose latest edition includes both parts) seems not to be available in French either, at least according to Amazon.fr.
Cartan's approach is fearlessly general. For example, whenever possible, he works in a general Banach space E rather than in the special case of R^{n}. Exterior products are taken with respect to a chosen bilinear pairing. Proofs are done in a takenoprisoners style reminiscent of Bourbaki (no accident, of course). Even the typeface is reminiscent of Bourbaki, in fact. The treatment is almost always elegant and complete, with careful attention to the underlying assumptions, particularly with respect to differentiability. (This is the first time I've seen an author worry about how many times a function needs to be differentiable for certain theorems to work!) It is all extremely well done.
Readers familiar with Cartan's other books will recognize some "Cartanisms." I particularly like the notion of "primitive of a form/function along a path," later generalized to "primitive of a form/function along a homotopy"!
There are some neat moments. At one point, Cartan describes a formula as "simple and easy (and important!) to remember" (italics his). At another, he says, "The remainder of the proof may be left aside by the reader who dislikes calculations. However, it is given for the courageous reader!"
I could not find any information on who translated the book. It is occasionally a rather strange translation. Manifolds are called "varieties," which echoes the French term but goes against normal mathematical English. Vector spaces have a "base" rather than a basis. A graded algebra is called "graduated." Sometimes "commence" is used for "begin" in situations where no native English speaker would choose the fancier word. On page 12, the description of what a shuffle is clearly incorrect, as is the definition of "support" on pages 5455. One could add many more examples.
Trying to learn this material from a book like this would be daunting for anyone but the most theoretically minded. On the other hand, reading this book after one has a good geometric picture of what is going on can be exhilarating. I would be happy to recommend it to anyone in that position.
The first mathematics class Fernando Q. Gouvêa ever taught was a vector calculus course for engineering students at the Universidade de São Paulo. He has been in love with differential forms ever since. Alas, he has never had a chance to teach this material at Colby College, where he is now the Carter Professor of Mathematics.
1.

Differential forms  
2.  Elements of the calculus of variations  
3.  Applications of the moving frame method to the theory of curves and surfaces  
Index  
Bibliography 