I have seen a few people praising "The Big Silver Book of Russian Verbs", saying that it is better than "501 Russian Verbs". I disagree. I have found at least 2 instances of verbs listed in the index that are not on the page where they are supposed to be, and, in fact, not in the book at all. Second, if you look up the verb in English, then you need to go to the Russian index to find the page it's on. How stupid is that? Can't they indicate the page in the English index too? The page layout of "501 Verbs is much better and I find it a better reference all around.