This book, and its "intermediate" and "advanced" counterparts, are among the most useful Japanese language learning tools you can pick up, especially if you are studying independently and/or trying to learn to read. It is NOT a textbook, but instead a resource for hundreds of basic Japanese grammar constructs.
All entries are sorted alphabetically (in English) according to their Romanized spellings. What's nice is if you read something such at "yomitai" and know that the "yomi" part means "read" but aren't sure what "tai" means, you just skip to the "T" section, look up "-tai" and there you go—a thorough explanation with detailed examples and a breakdown of how to conjugate it on your own.
This is the only book I've found that does not require you to know the English grammatical term for what you want to look up. You simply identify the structure in Japanese that you're looking for and find it alphabetically. There are a handful of things that don't really have a set pattern to look up (ex. relative clauses) for which you just look up the English, but that is the significant minority of cases.
This is hard to find in America (I bought mine at a bookstore while living in Japan), but can be found online. Retail is about $30-$38 each for these books, to give you an idea of how good a deal you may have found online.
Tags: download, seiichi makino, ebook, pdf, a dictionary of basic japanese grammar 日本語基本文法辞典 (japanese grammar dictionary series #1)
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