This is a great book for an introduction to write jottings, fieldnotes, and finally ethnographies. It is also great for get to know the basics of "how to" fieldwork in a practical sense. I've read the second edition of the book. As authors imply, it is reorganized for clearly furthering into the issue of writing fieldnotes.
I, especially, emphasize the book's organization, because, for example, it does not directly give you the footnotes on the same page. Generally I don't like this kind of "endnote" books. But in this case, it does help you to get the idea of not to be exposed of theoretical, conceptual etc. concerns related with ethnography but to write only fieldnotes, in their proper way.
Yes, it is sometimes repetitive, but it only gives you an empty concept, fieldnotes, and teaches you how to fulfill it, and finish ethnographies.